Nimble group and MTN adopting "don't care" attitude when dealing with ***** accounts of "supposed" customers

Someone *****ulently took a cellphone on contract at MTN using my name in 2021. My bank account was debited twice in 2021 and I cancelled it because it was an unauthorised debit order. Later I discovered that someone *****ulently took an iPhone using my name. I contacted MTN and I was told to submit an affidavit, which I did. I received clearance letter from MTN and I was told that my name will be cleared. Later Nimble phoned me asking me to make a payment on the MTN account. I informed them that I settled the matter with MTN and I also sent them an affidavit and clearance letter. I was told that my account will be closed. However, the account has never been closed and I have tried several times to close the account without any success. I was given a clearance letter by Nimble and this is not helping because the account is still open and I’m blacklisted.