Disgusting service

I had an issue with an MTN debit order called them to cancel my contract and they got their phone back within the specified time we agreed on. I had no money on my actual account with FNB because I moved my funds to the revolving credit account, FNB without my consent took money out of that revolving credit account to clear the debit order which I never authorized for them to do and when I disputed all 4 transactions I was reffered to mtn and mtn said I need to speak to my Bank I disputed the debit orders and I was told from the Uitenhage branch my money will reflect immediately and that has not yet happened I have been having a terrible customer experience with FNB and they are not resolving my issue it is still pending and no indication of when it will be sorted I am tired of the poor customer service what would it take for you guys to honor your VALUES????????????????