Incorrect billing - no feedback

I have been incorrectly billed for two months in a row, resulting in excessively high debit orders. <br> <br> I contacted the call centre, and reported the issue on 3 October, and received the reference number (S3-9JJAL-L6CQ). <br> <br> Since then, I have received no further communication from Vodacom, and I still see an incorrect amount on my online profile. I am going to cancel the debit order so that they can not incorrectly debit my account, but I know that this will lead to additional inconvenience as my service will be suspended while this issue is resolved. <br> <br> It's puzzling that a simple billing query can not be promptly and amicably resolved. I am very much looking forward to the expiry of this contract and porting to another service provider.