Upgrade done without knowledge

I discovered that my three contract that had with vodacom has expired, vodacom has upgraded them without my knowledge. On the first contract that was upgraded I called vodacom to lodge complaints and was told to send affidavit which I did. Vodacom promised me that they will do investigation and come back to me of which they never did. On the 12/11/2021 I made a follow up with vodacom and I was told ***** department never did investigation and once they are done with investigations they will let me know.

On the 12/11/2021 I called vodacom cancelation department to cancel the other two contract that had also expired. I spoke to a Man named Jerome and he promised to cancel the contracts to prepaid and he promised to do that. For my Suprise on the following day I received email from vodacom stating quotation on upgrade. I never did any upgrade. I quickly run to vodacom to find out what is happening because I canceled my contracts to prepaid.

On the 24/11/2021 I made follow up and i spoke to a lady called Nonhle and she said she will email head office to refund me and cancel he upgrade.

On the 10/12/2021 I received account statement via email and nothing has been done and my monthly premium has been increased instead to be reduced.

I need help, I tried to sort this issue with vodacom unfortunately they are taking me for granted.