HDFC Bank — no cost emi & 3rd party cash txn

Address:

New Delhi, Delhi

From 04.10.2019 to 17.11.2019 (as visible on internet banking) my a/c balance has been deducted with Rs. 177/- on 11.10/24.10/ 01.11 & 14.11.19 i.e. total Rs. 708/-in the name of "3RD PARTY CASH TXN INC GST". I am unable to understand these charges are for what transactions. No such deductions are made in my Other Bank A/cs.

Now again deduction has been made as below:
27 Dec 2019 3RD PARTY CASH TXN INC GST 27 Dec 2019 177.00

2ND Complaint is about NO COST EMI /SMARTBUY Offer on Credit Card, as per information through netbanking and e-mails, I bought a mobile in May 2019 and it was confirmed by seller also that no interest will be levied and whatever interest will be charged in 06 months' EMIs, will be refunded after full payment will be made and EMI amount was completed in November 2019 but till date NO REFUND OF INTEREST AMOUNT has been received.

Please provide solutions to both the above mentioned complaints and also inform how to contact customer care as with your phone banking option nobody can reach customer care representative.

Thanking you,
Bhavna Gupta
E-mail: bhavna.[protected]@gmail.com