Issues with Altec Netstar not clearing my account

I have been having an issue with Altech Netstar, where in 2018 I owed them an amount of R1037.36, after cancelling my Tracker subscription with them. I therefore subsequently made two payments of R500 on 10 August 2018, followed by a settlement amount of R538 on 07 September 2018, and also send them proofs of payments so they could allocate the payments and clear me.

However, around the beginning of 2019 I started receiving calls from their debt collectors stating that I needed to make a payment of R1038 to settle my account, following which I forwarded them proofs of payments that I had previously sent to Altec Netstar accounts division, for the above-mentioned amounts, including the invoice from Netstar indicating amounts owing and account numbers provided to make those payments.

I therefore had hoped that my account would be cleared following me sending them the proof of payments however, that was just the start of my harassment up until today (06 August 2020) as I'm writing you this email from my frustration, as for the past two years I've been in contact with the Altec Netstar and their debt collectors referred to as "Creditworx", telling them the same thing about payments that I have long made in 2018, and sending them proofs of payments again and again, and from today's call from I also learned that the debt has now increased to +-R1200 as a result of them not allocating the payments I have made to clear my account.

Please Hellopeter assist me in getting this matter resolved, as I recently became aware that my name if reflecting badly on ITC due to this incompetence by someone at Altec Netstar and Creditworx to just simply use the proofs of payments that I have been sending them for the past two years to clear my account, so that I can have my name cleared with them and with the ITC.

Thank you.