Impossible to end contracts with Vodacom

Lol looking at the reviews of this company to see is it only me. Can't tell you how long I've been trying to cancel my contracts I no longer use only for vodacom telemarketers to keep migrating my contracts. Not one of these contracts have ever been signed by me yet I have to pay R1200 every month for another year. Crazy. But I want others to know, if you want telemarketers to stop doing this to you. Go into your nearest vodacom store and put a ***** alert on your number. That way nothing can be done over the phone. Then when your contract is coming to an end, go to vodacom store and try cancel it that way. Maybe that's the only way to end a contract you signed with the devil. Or maybe not. It's just impossible to end a contract with vodacom. Is there a clause in their contract that its a lifetime deal?