Mtn harrasing me for money!!

Good day,

I dunno if Mtn is looking for money out of people seriously. But it seems this weak I've been there prime target. I don't know where they got my contact details from and my ID number but according to them I had an account with the in 2014 of which I have no idea off. Please MTN can use go look money from people ows you money. If I should get one more phone call or sms from MTN then I will be taking further steps.