Inadequate security on Discovery credit card and inadequate ***** follow up.

I have had ***** on my Discovery card twice !! now... people making purchases and amounts being deducted from my credit card. In both instances I have quickly noticed and cancelled the card, reported ***** and had Discovèry day they will revert and repay the funds. In both instances nothing has happened despite my emailing several times. I have never had ***** in any other card. My complaint is that I think their security is inadequate and their follow up on ***** cases is totally inadequate. They make promises they don’t keep, like we will attend to your email in 2 days because it is important to us.