Citibank — unauthorised credit card charges

Address:

43/2 Prems Flats, Rukmani road, Kalakshetra Colony Besantnagar, 600090

Early morning between 1.13 am and 1.52 am i have seen a series of transactions in usd, aed, gbp at various outlets like :
Priority pass ap usd 439
Great deals aed 887.25
Dadabhai travels aed 1225
Crate clothing nzd 89.90
Reatryl.com usd 49.95
Reatryl.com usd 1.95
Blackcab system ron 17
Dominos usd 33.99
Dellmont eur 10.42
Walmart.com usd 15.19
Portwallet.com bdt 1000
Deliveroo.co. Uk gbp 75.60
Deliveroo.co. Uk gbp 86.89

All these transactions had otp verification. The one time passwords have come as sms on my phone, but i have not used them. Obviously some one else has found a method to access my details as well as my otps.

My credit balance was rs 58541.38 and this has become rs - 671.21!!

Please look into this problem urgently. I need a refund of all the unauthorised charge on my credit card.

Today morning i called citibank and requested to block my card.