UniverCell — regarding cash back

Address:

Pune, Maharashtra

Sir, I have purchased a cell phone (note 3) on February 2014 for Rs.46000 from univercell store phoenix market city pune. I was supposed to get 1500 cash back within 3 months. But its been almost a year now. I have been continousl following up with them from last 7 months and they reverting back. And now they are being rude and saying me to do whatever i want to do. Being patient i have waited so long now i want some strict action against univercell pune.