Telkom will not stop invoicing a closed account

I have cancelled my account with Telkom last year in October. The amount paid turned out not to be the full amount as I had paid based on last invoice. This account was settled in January after speaking to a consultant who specified the amount needed to be paid. I requested a settlement letter as I needed to prove to another network that indeed I had settled the account & can take out a contract with them. After paying & requesting a settlement letter, a debt collector contacted me to say that I still had to pay an x amount of money on the account. Because I need to get this letter I then decided to pay without asking questions. It’s now been over a month & I still have not received this settlement letter. Instead woke up to another invoice from Telkom.

This is honestly a ripoff & can not be legal. Why the hell am I still being invoiced for an account that has been paid up? To make matters worse this has affected my credit score. This is actually very unfair.

I would never recommend anyone to take out anything with Telkom. It’s a nightmare to say the least.