Incorrect billing

I have been continuously incorrectly charged and my bank account debited despite the numerous times I've reached out to MTN to try and get this rectified. Each time I get told the matter is being dealt and it will be rectified, this is still not resolved. This has been happening since April and the lousy excuse I get is "it's due to the system upgrade on their side". The debit order went off once again for the month of July, making it four consecutive months where I'm billed four times what I should be billed

I unfortunately cannot reverse this as I know the horrible effect it would have on my credit record. It is still a bad reflection on my credit rating as it inflates my expenses. I will be holding you accountable in this regard if need be.