Tired of waiting

I bought a blackberry z10 at edgars jabulani on the 24th march 2014, late May my phone had a software problem i took it back to the store they booked it in for repairs. The Third week of June i got a call from the store saying i should fetch my phone only to find out that it had been exchanged.late October my phone died again i took it back to Edgars for repairs then I got an sms mid-November from telkom saying that i have to pay R188.10 for courier services i then paid it but my phone came back and it wasn't fixed it had a sticker written B.E.R (BEYOND ECONOMIC REPAIR) the phone isn't physically damaged meaning it is not my fault that the phone died so i just don't get it,i have been calling and going to the Edgars every week to enquire about my phone and they told me that i have to pay R188.10 again because Matshepo rebooked the phone and promised to fix the phone for free but now i have to pay again which i don't understand why i believe edgars is not doing enough because they only enquire when i call or go to the store,it has been 6 months since my phone went in for repairs i have waited for so long i now want my money or a new phone because it's really unfair to