Amazon — False marketing to dupe customers to take extra bucks during payment

Address:	400105
Website:	Amazon.in

I placed order through amazon. The app showed me to pay rs 50 for same day delivery thtough prime services. I opted for the same. After placing the order the app says my order will be delivered by 19th aug. Amazon is cheating customers like how. Why did they charge 50 rs extra for.amazon call centre agents are dumb to the core and never are able to give right answers.
Under prine membership without paying rs 50 extra also i can get the delivery by friday. Now i am not able to cancel my previous order. To register complaints they only have call back mechanism which is of no use as the conversation ir responses are not getting stored anywhere. They have a feedback email id which they clearly specify that they do not reply to feedback mails and never write back. I have not received any customer complaint number from amazon.
Pfa image which clearly says rs 50 for same day delivery with prime membership.