Amazon Pay — charge dispute

To,
The chief Manager
State Bank of India

Subject-charge dispute
Dear sir,
On 5th of june 2019 I was bookin ticket through on redbus whose payment was done through amazon pay via SBI debit card.Money was debited from my account but I did not get ticket .I was waited for some time but did not get my money refund and SBI is denied to refund money.
I request you to take legal action.
I hope i will get my money refund soon.
Thank you.