Reliance Trends — Gifts-Billing issue

Address:

Pragathi Nagar, Nizampet,Telanagana

Dear Sir/Madam,
Recently we did shopping at Reliance trends, Pragathinagar, Hyderabad,

After shopping, they given some gift box, since we did shopping for 5000 INR.

After coming home and saw the bill, surprisingly we found they have added some amount for the gift.

Just wondering and went back to them, no help, and answer to our issue?

They are simply cheating the common man with offers/gifts etc.

But adding the amount in BILL.

one more surprising here is, no common man can understand their bill format!

Requesting you to do the needful .