[Resolved]  Snapdeal.com — denying receiving of the payment

I, siddharth goyal on 17 february and 18 february made three transactions on snapdeal.com for the same product i. E, sgreat cashews 1000grams, pack of 2 but all 3 transactions were unsuccessful and the money was debited from the account 3 times but reversed back only once.
I used sbi debit card of my mother meera goyal for these transactions as snapdeal gives 10% off by using sbi cards. Now the debited amounts were rupees 1886, 1886 & 1913 but i got back only 1886 one time so the total of 1886+1913 is still not credited back in the account.
Details of accountholder:
Name : meera goyal, account number:[protected].
I have contacted sbi branch for this issue and they said the bank could not help me in this case as the money is not received by the bank and it is snapdeal which has your money.
The sbi says snapdeal is having your money but the snapdeal is saying they have not received any money. Please help me out.