Vodacom debiting my account after cancellation

I'm frustrated with Vodacom sending me from pillar to post regarding a contract cancellation. I requested a cancellation and I paid the amount due within the stipulated time. My services were cancelled shortly thereafter and I was assured I would not be debited. Come month end I was debited and told there was an invoice issued that was not included in my cancellation fee. What nonsense is that? How do you then make me pay for a month when I don't have the services in that month? I was told it was being investigated and I can reverse the debit order. I reversed it with my bank. Now that amount is still reflecting as outstaNding and has been transferred to another account I have for LTE. Spent over 2 hours being transferred between departments. No one went back to listen to the cancellation recording and there's no actual investigation taking place. All I'm told is "I've escalated" if not "let me advise you that there was an invoice issued". I'm not paying an additional invoice when I was so clear in my request and also did not receive all those services I paid for. This is pure greed and nonsense.