Mtn is a ****

I took a contract w mtn and the person who sold it to me was misleading as he told as soon as I get my Sim card they will be able to Port it back to my original number. When I called mtn upon the arrival of the Sim card they said they won't be able to Port the number. The only way to use the simple is to buy a modem worth R500. Then I told them I won't afford the modem, I will rather cancel my contract. Since then in March they've been sending me from pillar to post or they don't answer they lines. I have not used the Sim card and money is been deducted from my account