We were renting a car from Optima long term and months before renewal, we had contacted them ourselves first to discuss for family continuity. After discussing with their manager, he agreed on same rates and same terms. We then confirmed our understanding via email, and ask for them to send a renewal contract if we need to sign on. No word from them at all.
Then 8 weeks later on the last day of the original contract, we get a call saying they had not agreed to what was earlier agreed and the terms are now different and will cost us more. It was either agree with their new terms or give car back straight away. We said this was unfair and so dishonest as no one in Optima's team contacted us at all and they sprung this right on the last day (and right before CNY!). We asked for one additional month grace so we can find another place to rent from - but even this additional month, they cannot honour the current rate, they had to charge us more! Some BS about not able to change the system from the senior manager who apparently runs the team!
Service was great before the last manager left late last year, since then, they have been sloppy, non-communicative, won't admit they have been in the wrong, and been so arrogant and terrible client servicing! Didn't even apologise for their screwup. Bad experience!

Optima Werkz provides excellent customer service. The staff is friendly and helpful. The car condition is good. The process is smooth and hassle-free. Thanks for the high standard service - Chen, Rented Honda Shuttle

The staff at Optima Werkz is friendly and attentive. The team recommends the right car to my needs. The price they offer is reasonable to me. I have hired a Toyota Axio; the condition is tiptop. The car is clean. - Alex Lim, Rented Toyota Axio

I was a bit sceptical initially as I did not rent from Optima Werkz before. My impressions started changing for the better just after the first two rental services from them. Their price is very reasonable. They don't charge extra for anything else, no hidden cost. They have a very nice and cosy waiting area. I was a satisfied customer. - Winnie, Rented Toyota Axio

I want to thanks Gladys for the excellent service. She is fast in response and friendly. She always offers me a good deal for short term rental service. I have introduced a few of my friend to her. She never fails any of us with her good service. - Roy, Rented Volkswagen Tiguan

I rented a PHV car from Optima Werkz. They explained to me all the details needed and provided me with the assurance that everything is done within the rules & regulations set by LTA. The price is reasonable considering the amount of service they provide. -Melvin, Rented Toyota Axio

This is a sincere company with no hidden cost. The staff is very patient and went extra miles for the entire car rental service. The car that I received was thoroughly cleaned both interior & exterior, the best condition in my experience so far. - Cindy Lim, Rented Hyundai Avante

I rented my car from Optima Werkz for more than three years. I tried a few rental companies, and I feel that Optima Werkz company is the best for the services and car condition. - Ms Kho, Rented Hyundai Avante

The staff in Optima Werkz is efficient, helpful and reasonable. This company is reliable too. Cars are in good condition and clean. I will recommend this rental company to others out there. - Anthony Wong, Rented Toyota Sienta

Optima Werkz has a comfortable lounge environment for drivers to chill while the cars are undergoing careful checks and care. Highly recommended! - Mr Tan, Rented Hyundai Avante

This is my first time renting from Optima Werkz. The transaction is easy and smooth. The staff explain the contract in details and is patiently in answering all my question. Thanks for the excellent service. - Ken Chong, Rented Volkswagen Tiguan

I have a few terrible experiences with the leasing company. Optima Werkz works professionally and offers pleasant leasing experience. The staff is responsive and helpful to my requests. The car condition is tiptop with reasonable pricing. I will be recommending to others. - Wei Lun, Rented Honda Shuttle

Optima Werkz has been the most pleasant to deal with. They're very professional, prompt to respond to any enquiries and always provide such an excellent rental service to me. It is highly recommended. - Louis, Rented Volkswagen Tiguan

I have leased from Optima Werkz for years. Easy and fuss-free. The car condition is excellent and clean. The staff is attentive. Great experience. I will highly recommend this company to others. - Lam Zi Ting, Rented Toyota Voxy

I want to thanks Optima Werkz for there excellent services. They are fast in response, knowledgeable in what they are doing. When you lease with them can always be sure that your car is always regularly serviced and can drive at peace of mind. -Jackson Lai, Rented Toyota Rush