********** MTN account

I took a contract phone I signed for in July , I received an e-mail later on some time in October if I not mistake , thanking me for adding another line of I never did . I visited the Mtn branch in Carlton centre where I opened my contract account they couldn't help was told to visit the Mtn 14 avenue of which I went straight to ,I was told I opened another now I have 2 phones taken under my account .another account has been opened on my name of which I don't know anything about ,I'm tired of vising the Mtn head office at 14 avenue they not helping at all.