Delay on repairing

I bought a fondi tablet from russels in november 2014. I experienced a problem with it and went back to the store to have it repaired. I already sent it back in may 2015. I went back to the store sevral times to find out what was going on and every time they would tell me they did send it to be repaired. Up untill today nothing has changed. Im still waiting and its been almost 2 months now. They cant tell me whats wrong or give me a time when it might be fixed and returned. Every time i visit the store they say maybe it \might"be back next week but next week isnt coming"""