I cant access my bank account due to MTN

I went to FNB on early march 2015 to open a bank account. The bank account was opened but to my surprise I was unable to access the money in the account. Then I went back to FNB to inquire what is happening exactly with my account, the bank told me that MTN has blacklisted me due to ***** and I told the person helping me at the bank that I never had a contract with MTN before, they tried to call MTN head office to get clarity on the issue but their phone was not answered. I went to MTN Wonder park on 20/04/2015, they checked me on their system and they said there is nothing on my name I should go to a bigger MTN branch. Then I went to MTN Menlyn on 27/04/2015 to inquire about the account Naki was the person helping me. He called Head Office but still the phone was unanswered then He took my details and promised that He will call then the following day and He will give me feed back before Tuesday(31/04/2015) but to my surprise he never got back to me til to date. Now I am working and I am being paid well but I cant access my funds due to MTN.