Zingoy — not received my cash back

Address: Davanagere, Karnataka, 577213

I redeemed my cash back amount to my bank account but it's not credited to my bank account when i redeemed my cash back amount to my bank account they removed and said it's due to technical error it's almost 15days over still not received my money now they are not responding to my mail please take legal action against them as soon as possible because my cash back worth1700 rupees