Still being incorrectly Debited

I was reassured by Lucian from Vodacom that my previous contract was cancelled and my debit order will be R150 per month its two months now I did contact Tasnym at Vodacom Tygervalley in mid October to resolve the matter but again my account was debited for R358 for the second month. I demand a refund and for this issue to be resolved, its now months and the matter is still not resolved. this is the height of incompetence. I demand my R416 with interest with immediate effect