MTN doesn't resolve ********** accounts opened in their clients names. ***** victim in need of help.

I have a a contract with MTN for a number of years now. In Jan/Feb 2018 there was a ********** account opened in my name (second & third line added). i reported this to MTN as it was happening as I received a message indicating that I am adding an additional line to my contract. I eventually tracked down the shop where this was taking place as I was been taken from pillar to post. The gentleman at the shop who sold the phone to the ********* was very casual about the matter and informed me that he will suspend the line immmediately and will report the matter. Come month end when my bill for the account came, I was owing more that 26k, how I wondered if the line was supposedly suspended immediately. When i went to make a payment i was advised that i owe more that 26k, I explained to the lady what had happened and i was advised to change my payment method to cash as MTN would deduct the outstanding amount from me if they had not resolved the issue by the date of debit order collection. I then changed to cash payment and continued to pay on a monthly basis. I would call MTN from time to time and check if the issue was resolved and I would be told that their ***** department is busy investigating. I then discovered that there was a listing on my credit record stating that I was a defaulter because MTN put my name on the list as someone who doesn't pay their debt. I then inquired again and I was told that they have discovered it was a ********** line and it was suspended but now they have to generate a tick so that the outstanding amount would be credited to my account. I was glad it was resolved as i was due for an upgrade. When I went to do my upgrade I was informed that i was owing in access of 10k and I again explained what had happened. I could not do the upgrade on the day and I was told they would check and see what happened. I was later to that they had done everything but someone didn't instruct my account to be credited and had to wait for the next payment date (run). this was then resolved and i could upgrade. Now not even a month later my service has been suspended and I am not able to do anything my phone is just baggage in my pocket. When I call MTN they tell me that I am owing 9817.87 and they see that the ***** department has not done something and that it has to be taken to them and my line cannot be opened. It has been 10 months since i reported the ***** but am am still being told that i owe monies while I have been paying my account on time on a monthly basis. Someone there seemingly has not been doing their job if they can investigate and confirm that it is ********** and issue an instruction to credit my account but that isn't being done I have no idea what one must do. I am really gatvol with MTN and I am ready to jump ship and advise anyone not to do business with them, they are really a huge disappointment, no wonder Nigeria what billions from them, they should just close up shop if this is how they treat their paying customers.