No service from Mtn

I was offered a second cell phone with 2 SIM cards on a special. I returned the unopened whole package within a few days of receiving it. I have since been charged nearly R250 a month for something I don’t have. I have tried going through your branch at Clearwater Mall. It seems that you don’t even answer your own staff. I want a full refund of all the money that you have ****** from me since July last year. I am due an update but am seriously thinking of going elsewhere. Your service sucks.