Balance outstanding

I bought stuff from homechoice in July 2015, just few weeks after i got them a consultant called me to find out when i was going to make the first installment. I told her that ill be paying what was owed to them in full. I did so in 2 payments in a less than 2 weeks period in August. To my knowledge i had settled the account. In December they called me from their collections department asking why am i not paying them? I explained that i thought the account was closed as per conversation with their consultant in August. I then sent them a letter in December no responce from them i called them i was told to wait for 2 weeks for a responce asking them to resolve this and to listen to our conversation. They have responded now 4th of January saying ng that i did not ask for a settlement value. Really now when one says they'll pay the balance in full whats that suppose to mean. The responce i have been getting from their side is that the consultant did not give me the settlement value. These guys calls me twice a day everyday. I have responded by asking for the recordings again nonresponce. This is a harassment now. Nomsa.