Telephone Calls - where is the call that was recorded.

I ordered good from Home Choice in September 2018. I Asked the lady over the phone that it must be a cash transaction. She said when I received my Goods Invoice I must deduct the facility account fee and pay the outstanding balance. My total due was R4385.39 and deduct the facility fee which was R413.89. I paid R4000.00. For the last 4 months the call me everyday and said that I owe them money. I asked them to listen to the call that was recorded. But they still call me everyday. Please their services are no longer required and the employees do not know how to speak to clients. Will definitely never order at them again.