Flying Machine — jeans wear. i did not receive bill for my jeans wear. and they are not reducing discount price

Sir /madam
I brought jean pant from flying machine showroom which was at cmr central, maddilapalem, visakhapatnam, andhra pradesh.
They disnt give me bill and they manipulated the discount price. When i asked they said they will message me the bill with details. I did not recieve any messages from them. Kindly llook on to the issue and take necessary action on them.