horrible customer service

I had submitted my new banking details for a debit order to MTN over a period of 12 months I have email proof there customer care line kept getting different agents to email me back but the trial of emails shows what the initial email stated no one loaded the banking details I made payments and then paid R700.00 last year in September I don't even know whether they credited that payment . I need to clear my credit score with this account so I would like it if someone could please give me a clear indication with regards to whether you can deduct because prior to your offices handing me over I made various debit order arrangements and not once did your offices deduct the onus was on your offices to log the debit order instruction on your side and proceed to deduct it would have not caused this much prejudice to my credit score and the account would have been settled months ago.

Your assistance herein will be appreciated as your offices response turnaround is quite poor and one does not receive the best support from your branches as I have on multiple times to MTN- Vincent Park and they told me to dial 135 called the number no one assists, emailed your customer care line the matter keeps getting logged I submit my banking details no one calls me.

Kind Regards,