After a year and no device

I sent in a Huawei mifi device for repairs only after a few days of receiving it due to the sim card getting stuck. I took it back to the shop in Cavendish, where I originally got it, and they booked it in for repairs on 10 May 2014. Subsequently I have visited the shop on more than 5 occasions in order to get an update as to the progress. I pay R419 per month for a device I have never had the opportunity to use! It is now 21 July 2015 and there are still no answers. I last went to the shop this past Sunday and they said they would follow up within a day and still the silence continues. I would like to be compensated on all the money I have paid in subscription fees and it would be nice if I got my device back. 14 months and counting...This must be ******* <br> <br> Yours sincerely,<br> <br> An irate customer