Vodacom ***** my money

Since Febr 2017 Vadacom has been deducting R600/month from me for a data contract that I never agreed to. Thats 15 months and R9000 in total. For some reason they are not able to stop the account, nor pay back my money.

No one at customer care or ***** department can assist me. Not even an affidavid stamped at a police station helped. Complains seemed to disappear from Vodacom's system. No one at n Vodacom shop even try to assist me.

How can Vodacom open an account on my behalf if they don't have my signature on paper? Will it be fair if I go into a Vodacom shop and take something worth R9000? Because that's what they did to me.