waiting on constructive feedback

I purchased a cellphone Blackberry Z3 in January at American swiss Westgate mall 5 months later the phone starts giving me problems i took the phone back to the store to have it fixed.Weeks later the cellphone comes back only to find out 2 weeks after that the phone starts giving the same problems again i took it back to the store on the 05/08/15 after 2 weeks they let me know there's a crack on the screen however i did not hand in the cellphone like that.So now I'm struggling to get constructive feedback from the store they keep on giving me I'm stories its almost a month.They say they gona<br> refund me but I'm still waiting I'm getting sick of this now. What do i do from here?