ACE rent car ruined my travel experience

I doubt I can call ACE a business because it feels more like a racket. I was forced or deceived to purchase additional insurance coverage, despite the fact that I had already purchased liability insurance from Qeeq. Furthermore, I dropped the vehicle 1 hour after the requested time. I was told that there is 30min I tried to gain sympathy of the staff. They were very adamant and say they have nothing to do against the system and they even add 30 min more to my arrival time because I had to use their toilet before I sign the drop off (the vehicle was already in their possession). They charged me a whole additional day, even with full insurance. I only realized this once I have received the invoice at the airport. I think they waited for me to leave the premises so I would not have the opportunity to complain. Really a bad experience and I felt I was scammed.