HDFC Bank — cashback not received for consumer durable loan

Address:

Khordha, Odisha, 751020

I had taken a consumer durable loan to buy refrigerator amounting 47500. At the time of buying I was said 5% cashback from HDFC bank. The cashback should be processed in 90 days. But the cashback was not processed so when inquired the customer representatives said that they did not have such offer. But I shared the proof of delivery order from HDFC Bank stating the offer. Still they are not proceeding with the cashback and not giving any valid reason.