Telkom does not close account properly and keeps claiming I owe money though everything is settled up.

I moved out of South Africa and closed my account in 2015. My last invoice was settled with the deposit they held from me for over 10 years, as I couldn't just set up an account without a deposit as I am not a south african resident. it is now 2018, 3 years since me moving, and attorneys are now sending me letters claiming I still owe money. I have a chat with telkom which I saved in case this were to happen, never thought I would have to go back to it 3 years later.

It is appalling, worst service ever, accounts department in shambles, I have no words for the anger I feel right now.