More than week without anyone resolving my issue

I called Telkom Mobile last week Tuesday (19th September 2017) to get a settlement of an account that was settled in January 2017. A representative (Sifiso Vuyisile Ganca) told me I need to send him proof of payment for an account that has been closed and paid up since January. I honoured the ridiculous request and he said the request would be resolved within 12-24 hours. I called followed up within the 24 hour window via email and without any response. I called the Telkom call centre again after 24 hours (Wednesday) and spoke to Nontokozo Ngcobo. She told me it was unnecessary to send a proof of payment but that my request would be resolved between 24 - 72 hours. I followed up on Thursday again as it is urgent and I was told the person who was supposed to do it is not around via email. I followed up on Friday via the call centre and they told nothing had happened from the other department and the call centre agent had "escalated" the matter. Called this afternoon (26 September 2017) same old story with an "escalation".

I'm not on Telkom anymore because of poor service or lack of. It costs me so much money and time to call you. This is unacceptable for something so simple. I got into this mess because of you guys messed up my account and now the Bank needs a settlement letter to prove it has been paid up. How difficult can this be?