Terrible customer service

I have been with Vodacom for about 17plus years. Never missed a payment then Covid happened so I fell behind. so I paid the full outstanding amount (R7616.59) in August. It took them 3 weeks to reconnect the phones. Okay so now we are sorted. I get the next month bill (R0.00). Now keep in mind these are the bills that they send me so I thought maybe I was ahead in payment. so I get an invoice 09/10/20 payment due 31/10/20, ok no problem. 29/10/20 my phone got suspended, I thought that is not right but ok. I went and paid the phone. They said the phone will be reconnected in 72 hours. So I phoned 72 hours later. So they said sorry phone this number ---- so I phoned this number. I have been handed over but my phones are paid until end of November (so not behind). I asked this person why has my phone been disconnected. He said I don't know because I can see the payments and there is no problem. Just sent us a certified grievance letter then we will take it from there.