Telkom, what a bad service provider

I have been trying to get a detailed statement from Telkom on payments made with no success, I have submitted a request to be contacted several times but the agents cant be heard on the phone. The agreed payment on the phone was also not upheld and I was only told today that I am only making partial payments. They do not send monthly statements, I only saw this month on registering the account on the Telkom app, that the amount is different.