Keep overcharging me! Im sick of it !!!

2 months ago we hired a box office movie .. till today i am being charged for it although we have payed the dam R35 extra. This month again they are asking to pay R35 extra. So in total now i must pay R908 for all their **** repeats etc.. i will not be paying the R35 extra... as we have contacted you guys lots of time and 1 of your call center workers told us to pay the R35 when we go pay our bill and that's exactly what we did 2 months ago..