Difficult cancellation process

They have every excuse in the book not to assist with cancellation. Firstly, I signed up for the Wi-Fi online, I requested to cancel, I was told I can’t cancel online and I need to go to an MTN store (why can’t I send a request to cancel online???). I went to an MTN store in Melrose Arch they told me they don’t assist with cancellations I must go to Sandton. I get to Sandton, Sandton cannot assist me cause they need some document the courier (DSV) would have given me. They didn’t tell me that document will be required for cancellation and I cannot be assisted without it. The gentleman sent a request for a copy of the document and 3 days later I am still waiting for it! Wow!