billing for returning the car

i was billed for returning the car the day that the car was suppose to be dropped ...i wanted to go to sandton to take the car since they said they cant deliver to me and randburg branch called to come and pick me up to fetch the car they billed me for that , i didn't complain about that and i did talk to the lady about returning the car to sandton as they don't work on Sunday , she even advised me that if i am going to return it after hours i can go to the airport but now i am billed for another day ..i am so disappointed , i thought your service was best like thrifty..<br> <br> ***