phone that went for repairs and never came back.

I purchased my blackberry 9720 at iSmart around December 2015, a few days after it stopped functioning, had lodged a query 5 times with customer care, after some few days nothing materialised I made follow-up, weeks, months passed without positive feedback, first week of January had contacted the customer care department which initially when I called a lady by the name of Sharon promised that my phone will be replaced with a new phone, eventually it was collected and suddenly the story changed was told that its going for repairs and will come back after 21 days, as we speak I do not have the phone back and its unfair that I end up paying monthly instalments of R395,00 for nothing worse a phone that I cant use, its hella frustrating this company called iSmart is nothing else but a **** people must be warned, I think its totally unfair to be paying for something that's not even there, if Hello Peter doesn't assist me imam report this company to my lawyer, hoping that Justice will be done.