No internet, no resolution, no care, no refund

I can't remember when last I had this terrible customer experience. I ordered an LTE router, day 1 internet works. Since then, internet has been offline. I called EVERYONE at MTN. Customer care, billing, coverage, sales, RICA the works. And no one can assist, and everyone tells me call "this" department, but what they don't know is I was just referred by that department. Arrhh it's unbelievably frustrating. And now I want to cancel and get a full refund, why pay for something you are not getting. But now they say I must go to an MTN store. The audacity to request this, after everything, after all the airtime I used and hours spent trying to resolve this, after my patience. Unbelievable to say the least. I want a full refund, as well as an airtime refund, and I want the router to be collected.