Telkom leaves a lot to be desired

I have had a contract with Telkom since 2018. Every month I had a set amount that was paid. No problems. Up until beginning of this year. Now every month my due amount differs. I still pay. Then 2nd week of the month I will get an sms stating I'm either overdue or have an outstanding amount, without fail. But do you think I get a response from them, via Facebook, Facebook messenger, or email!? They don't even acknowledge the message. During lockdown they never loaded my data, but they loaded my minutes. When I queried, repeatedly, why, they tell me to log on to the app and see my account. I have repeatedly asked that they change my details. Sometimes they will take the details down. But every month they will still try and take off my old account. Telkom is more than happy to accept new customers, but they aren't willing to help paying customers, and keep them happy. The service from Telkom leaves so much to be desired, when you actually get service.