PharmEasy — about fraud offers to attract customers

Few days ago on 22.08.2020 i have placed and order. as common people do I have checked cart value and placed the order. but after placing the order and when the bill is generated the amount is varies and they are saying the wallet money cant be used . and I have checked medicine price before placing and after the bill generation. There is no sigle Rupee change visible. they are asking me to do payment and then after if they found issue they will check about this offer.is this the right way to fool customers. I do have faced this issues in their past order of airtel money cashback offer. nothing is recieved till now. my order ID M22039939.
so I request all of you please check cart value and value which is shown in invoice. and never expect any offers from this fraud company. they have wasted my 5 days for this problem .they don't value their customers time.loss of time and money.
for reference I am attaching the screenshot which I have taken before and after the bill generation.