Not allowed to give a car back or I need to pay more

I rented a car for this month. Paid deposit and monthly payment. I called last week to ask if I can bring it back and only get my deposit back. I got told I need to bring it back at the exact time I took it. I told the lady I am working and I can not come that time. I asked of I can please bring it on the weekend as for I can not afford to take of work. She said no I need to bring it that day that time. I was not informed of this when I got the car. If I knew that I would have taken it less days. I got informed I will pay "normal" rates if I bring it back earlier and loose my deposit. None of this get communicated with the client and I feel it's bad so I should rather loose my job (this is my feeling) instead because I am not allowed to bring the car back. I asked to collect car also got told no then they going to charge me again. I just want my deposit back nothing else and drop a car off without loosing my job. But this fell on deaf ears. If this is how clients are being treated that can't afford cars any other way I feel this is unacceptable. Treat people with respect and tell them all this before they take a car from you. Now the car is standing in my garage not being used. My husband's account I'm in arrears because the payment he made only went off a week ago and not that day we swiped. I'm very upset that I can't give a car back (that you could have rented out again and made more money)