VVM and Vodacom

After months of receiving harassment calls, rude customer service personnel from these company allegedly accusing me of debt owed by me to Vodacom, I received an email from them without apologising that the case against me has been settled. I believe an apology is warranted in this case as I have been subjected to rude personnel who would even drop the call in the middle of the conversation. Secondly Vodacom should have also contacted me prior handing me over and do their own investigations as to what transpired. I feel aggrieved as a Vodacom customer to be accused of not honouring a debt which was nonexistent, but their own personnel wronged me by not cancelling the contract as per my request.