Unauthorized extension of contract after cancelation

After my 24 months cellphone contract came to an end, I decided to not renew or upgrade it, that is when my nightmare started, spoke to tons of vodacom cancellation consultants who never canceled the contract instead when I received invoices and contacted vodacom, I was informed that the previous consultant did not properly cancel and they will do it, and 3 months later, I'm still paying for a contract I didn't extend or upgrade, tried Twitter and that also didn't assist. I fact, they then canceled the main contract number and used their complementary number that was never on contract and either extended the contract without my approval infact despite tons of call trying to plead with them to cancel.