20+ years of bad service - I'm done.

I have contacted MTN via retentions to ask for the process to cancel my contract after 20+ years of being a customer without reply.

Today a woman calls and tells me I am due an upgrade (which I have purposefully not taking and which was in fact available for almost 3 months now). I advise her I am looking to cancel the contract and she hangs up on me mid sentence.

The number she called from is ***, no name was given.