What customer service???

My address magically reverted back to an address which I haven't used in over 10 years back in June 2019. At the same time my correspondence preference was changed to postal so I haven't been receiving my statements in 6 months. I have now called the call centre TWICE to fix this and despite telling me that it is changed... it was never changed. The call centre agent I spoke to today told me that she cannot change it and I will have to go into a Telkom branch with proof of residence to fix YOUR MISTAKE. I have a few questions which I need answered... Who changed my address back to the old one and the correspondence preference to postal? Why was my first Hello Peter complaint ignored? I have still had absolutely no feedback. This is seriously unacceptable and a breach in client confidentiality as my statements are now going to someone at the old residential address.