Mtn is a ****

I ended my contract with Mtn 17th June 2019, now all of the sudden I’m called by Nimble Group saying my already closed and paid up Mtn account has been handed over. Mtn is really ******** people, i tons of emails back and forth supporting this, now I’m expected to pay R1200 for an account that has been closed for over 3 years, I am highly disgusted at this