3 months waiting and returned faulty

about 3 months ago i sent my cellphone in for repairs with a crack on the screen that damaged the touch functionality. It took them 2 months to repair, with no communication from the store or the insurance. I had to make numerous phone calls and trips to the store and no joy, the store blamed the insurance and vice versa. Till today they cant over me a courtesy phone. They finally returned my phone with an excess fee of R250. 2 days later the phone started giving problems, it switches on and off and opens applications by itself and freezes. In late December early January I took the phone back to the store and explained the problem ,as the phone went in with one problem and its comes back with another. I told the guy that I am very unhappy and i am not paying another excess fee for a phone that a received a week ago with a technical fault. 2 days ago i received the following message (Dear Customer, IMEI No. *** . Job Card No. FOLEN*** Quote rejected/Beyond repair/Warranty voided/No Fault Found. Device return pending payment of service charge ? R330.00 incl.