HDFC Bank — void sale refund

Address:

Hyderabad, Telangana

I did a transaction at Hyderabad on 6th November 2018 of rs 3500 through POS(ATM SWIPE). Later, it was cancelled by merchant because the amount is 35000, not 3500. And, he says Void Sale will give you amount back within 24hours and given me a slip of Void Sale.

Date of Incident: 6th November

The transaction was done on 6th November at Hyderabad Patny Center through POS( ATM Swipe). The Amount was about 35000 but instead, it was placed 3500. After the transaction, we noticed it and cancelled the transaction by void sale. My Bank is SBI and resellers is HDFC. The amount has not credited till now and I am worried about that transaction.