Telkom refuses to change my address

I am a customer of Telkom for many years. I have recently relocated, and moved my Fibre to the new address. I am at the new address, where Telkom moved my service to themselves, and despite many attempts to update my address, I have just received my latest statement still reflecting my previous address. This is a joke. Telkom is providing me with fibre at an address where they installed the fibre, and are unable to update my address. All I want, is for them to change my address, and they are unable to.