Reliance Jewels — did not receive cashback as promised

Address:

Bhagalpur, Bhagalpur, Bihar, 812001

Dear sir/madam,
This is to you inform that, i had purchased ring from bhagalpur, (Bihar) store on dated 3/10/2019, and made payment from hdfc bank wherein cashback offer with hdfc card of 10%, but unfortunately still didn't get any cashback, aa my invoice number is tax invoice no. - axtcl219in000475 and registered mobile number is [protected],
So kindly do the needful or let me know the reason..

Regard,
Omprakash om
[protected]
[protected]@gmail.com