Vodacom unauthorised upgrades

Vodacom has *******ly upgraded my number and now I am unable to make calls due to the line being changed to a data line. After several phone calls and reference numbers, the issue remains unresolved. My number was *******ly upgraded to a dataline without my consent. When I rcvd the quote I advised them that I did not request the upgrade. I was assured the unauthorised upgrade will be cancelled. Only to find a couple of days later on my statement that issue remained. Several calls and complaints later, the matter remains unresolved. I even rcvd a sms that a sim swop was done successfully. Again when I complaint regarding *****ulent activities on my account, I was again assured that all had been sorted and that I do not need to be worried. HOW CAN CONTRACTS BE UPGRADED WITHOUT THE CUSTOMERS CONSENT!! For years I have been a loyal customer of Vodacom and now I am sitting with a number (that I had for years) that I cannot used due to it being changed to a dataline without my consent. I have been struggling for more than a month now to get the issue resolved, without any success. TOTALLY UNACCEPTABLE!!!!