Horrible service

In December 2015 i took in my phone for repairs which i received good service and got it back on 22/12/15. But then a week later it started acting up till i took it back to the shop in January. Since then im the one always calling the store to find out whats happening. Never even once did i receive a sms or call to tell me whats happening. At some point i spoke to the manager Mimi/Mimo who gave me a discount and promised to personally contact me to inform me of the progress and when its ready for collection but nix.l then called again and dealt with Catherine whom i explained everything to and said shes confirming with Mimi everything. Then to my shock i was told that Mimi said she doesnt know of me, my issues or discount. Catherine then said she'll calme back again but till this day no one has contacted me. And their policy states that \all repairs not collected after 3 months will be sold to defray expenses\". So im starting to wonder whether that is their plan because im being given the round around and dont know whats happening. PLEASE HELP!! Furious Disapointed Customer! "