State Bank Of India [SBI] — Amount debited without any purchase

Address: Visakhapatnam, Andhra Pradesh, 530046

Website: www.sbi.co.in

I am ramanamma, having sbi debit card and tried to purchase an item at bajaj shoroom by using my card on 10.05.2017. At pos machine the card swiped 2 times, but shown error. I am used another card and finished my purchase. But after 30 min's i got msg from sbi, "you are purchased an amount of rs 540/- at bajaj shoroom, gajuwaka, visakhapatnam."
Txn no - 470160,
[protected]-pos
A/c no - [protected].
So pls solve the issue and revert back my amount asap.