MTN CONTRACT RENEWAL HARRASMENT

My MTN contract expired in October 2021 and I do not want to renew. However, MTN contact me every single day by call (which I eventually marked as spam) via message - telling me they have lost my e-mail and I should respond to message, and send me e-mails every single day for the last 6 months. I have asked them on numerous occassions to stop calling me. I block the numbers, but it seems that they have random numbers and the harassment does not stop.

I keep on killing the call as soon as I see "IDENTIFIED AS SPAM". It become so bad that I started answering the phone and start shouting and swearing at the MTN employees.

MTN - STOP CONTACTING ME - I DO NOT WANT TO RENEW MY F**KING CONTRACT.