Transactions and Refunds on Niyo Cards

I just went through something very similar. Yesterday at 1AM my card was used to transact at dhgate.com. I received no OTP but the txns went through on my Niyo Global credit card. I called the customer care as soon as I saw those 3 transactions.

3 transactions worth 16.5k cumulative. I need immediate help. I spoke to customer care and he was of no help. He suggested I wait for team to respond. So far Niyo hasn’t responded to my mails.