State Bank Of India [SBI] — Unauthorised deduction from account

On 31 May 2016' I used my atm card for payment to a dealer. He swip my atm card and enter amount of rs 14000 which required to be paid. But erroneously payment receipt not printed and the transaction got cancelled and make another payment of rs 14000 . As per rule the amount of rs 14000 which got cancelled should be credited to my account however the same not credited resulted to which rs 28000 has been deducted from my account instead of rs 14000. The unauthorised deduction of rs 14000 are also not showing credited in dealers account whereas the same is showing deducted in my account. How can I get my rs 14000 refund. Please help me in refund of my money