Misrepresentation and over charging

I was a given a deal by Tanya for rental of a car for R148 per day for 2 days. She confirmed that there were no other hidden costs. I signed the contract and left as it took her 30 minutes to process the contract and I was late for work. So I paid R312 for 2 days.I needed the car for longer and extended the car hire by another 4 days- it was 6 days in total.This was the lowest class of car; a Chevy Spark; that could barely move.When I saw my credit card slip; I realised that the refund was incorrect and queried it on 4 occasions.Finally; I was given an invoice yesterday and noticed that I was charged for \super waiver\" for R82 per day! So I was charged an additional R500 for something that I was unaware of.And I was then informed that the actual cost of the car was in fact R312 per day and not for 2 days! can you imagine my shock and disgust at being charged this for a Chevy Spark? Customer care agents did not offer my reprisal.All they say is that I signed for it. What a load of bull! This is actually ***** as Tanya misrepresented the facts to me and actually \"******\" me of R500.I will NEVER use them again! Shocking service!"