MTN and bad service

I upgraded my account with MTN 3 months ago, I took a data account with a router that I also pay for. To my surprise I have received the data but never the router and I have been calling them, they promise to call back or I have called the wrong department. I have lost money calling them since the number for contracts since I opened it online from MTN direct is not free. I want them to cancel the router now as they do not want to deliver it., and since I have been charged for it, I want them to credit that amount.