SBI — deduction of money twice for one transaction

Sir,
I purchased one mobile phone (Lenovo k-6 power) on 19 jun 17 from dawar international electronics, sadar bazar, gurgaon for an amount of 10500/-.
The salesman swiped my atm debit card and asked for pin. I entered the same. I got one message from sbi vide trans id 481625 at 8:18 pm about using of my card for the amount (Rs. 10500/-). After a few minutes he told me that payment could not be received by them. Then he again asked for my card and swiped my card and asked for enter pin again. I entered my pin. After a few minutes i got another message from sbi for using my debit card for the same amount vide trans id 801096.

When i checked my account mini statement a few days later, i found deduction of same amount for one mobile phone purchase.

The mobile shop (Dawar international electronics) is not helping me. I am now in andaman & nicobar island. I am contacting them frequently but, they are taking my case lightly. I complained sbi also. But, no response from sbi till date.

Please help me and refund my money, sir.