Reliance Digital — Cash back on purchase of washing machine not received as promised

Dear Sir,

I have bought washing machine from reliance digital Jodhpur on Nov 20 and due to festival session they promised me to provide 10% cash back as on HDFC credit card EMI after 90 days . But even after 90 days they didn't do. When I complained they provided half cash back from promised. Know they are saying it's bank related issue so we are not responsible. I am feeling like being cheated by Reliance digital. Please do the needful.