Vodacom a never ending nightmare

i wrote a review 4yrs ago about the dreadful service i received from vodacom. i was placed on the wrong contract and was expected to pay bill of over R10 000. Their complaints dep was quick 2 respond and apologised. They cleared the balance, sent me the proof of the zero balance and informed me they would let their collection dep know and that the contract was canceld. Well iv been harassed for the past 4 years by different debt collection companies who vodacom have handed my account over to and everytime i send the proof a new DCA will then start harassing me couple months later. This has gone on long enough and i will be seeking legal advice and plan on getting compensation from vodacom regarding this.