Contract upgrade was done without my consent

I wanted to upgrade my contract but I was told that the upgrade was already done. I did not authorize any upgrade on this contract. The Vodacom outlet could not give me any information only that the upgrade was done by headoffice. Game told me that my upgrade was done online, but I dont even own a computer. Another problem with my other contract is that I was blacklisted because of a debit order that did not go through. The amount that was deducted was different from the amount that Vodacom told me that should have been deducted. Now they blacklisted me. If this issues are not resolved within 24hrs I will be forced to escalate this matter.