Pathetic service from Vodacom continues

On 15 July I did an upgrade with Vodacom. My upgrade was for sim only products. My previous invoice contract amount was R917,48. My upgrade amount is R248.

However, from the time of the upgrade Vodacom has been debiting my account for R917, 48 instead of R248. I have been calling in once a week to sort out the issue. Every week when I call I get a reference number and am told that the it will be resolved. However, this has still not been done. This is going on for 4 months. I have sent through various emails to staff in the finance section as well as back office with statements of proof of those debit orders going out of my account, to no avail. No amount of calls from my side as well as emails has been able to resolve the issue. Finally, I instructed Vodacom to cancel my debit order of R917, 48 and I will make manual payments of R248. I was assured that the old debit order was cancelled and will not go off again. Yet again yesterday, 2 November, another erroneous debit order payment of R917.48 went off from my account. This is *****. Is Vodacom going to continue debiting me for the rest of the 24 months contract for R 917, 48? This is unacceptable and not on.

Vodacom simply needs to urgently cancel my debit order and refund the amount of R917,48.