Mtn are ******

I took out a contract with MTN which ended July 2021 during looting, after the business went back to business MTN store at eyethu mall never opened again neither did they send communication to say that they have moved I went to the mall to close the contract but they were no where to be found today they have been harassing me with endless calls from collectors telling me I am owing them but my contract was paid in full MTN IS VERY BAD IN SERVICE AND THEY ARE ******