Frustrated customer

Vodacom has been sending me bills and they deducted my moneys for two months after I have cancelled my contract but still they claim that I owe them, even though I have spoken to several consultants who informed me that my contract has been cancelled.. I even stopped their stop order because they were still taking Minnie’s from my account even though, a consultant told me that Vodacom is the one that owes me for two months payments which was not supposed to go on… I’m just really frustrated with Vodacom right now, I need help asap.