New card blocked

My card was blocked as someone from Dubai tried to pay for something so got a new card sent out now I have received this card and activated it and now my new card has been blocked too please help

I just got my new card today and don’t know how to start a thing with them to talk to them if u kwam? How do I start a new conversation with them to talk direct so you know ?

Have managed to start a new conversation just waiting to hear back why new card is now blocked