I paid Off my Debt but I'm told to pay more

I had an account with Home-Choice which i couldn't pay due to being unemployed for a couple of months and it was handed over to Norman Bissett. I finally got a job again and called them to make an arrangement. The agent that called to make an arrangement advised that my outstanding balance as at March 2020 was around R4155, and to settle my account I had to make three(3) monthly payments of R1385 and my account will be cleared. I paid all my three months instalments and when I checked my credit profile I realised that my balance was still standing at R4155. I called them to rectify it and i was told i still have two more months to pay the same monthly instalment over and above R4155 I have paid over three months. and now this lady tells me my arrangement was for 5 months not three months that i was advised on. this is just unfair and unprofessional.