I 'm a holder of a XXXX Mastercard, issued by Barclaycard. In the last month, Barclaycard has stopped XXXX of my transactions and harassed me either via phone or text message that my card is blocked due to security concerns. 

The transactions ( XXXX XXXX / XXXX XXXX / XXXX XXXX and two times on XXXX XXXX were in range between XXXX - XXXX USD. As Comparison, my Credit Line is XXXX USD and my annual spend with the Card approx. 60k USD. 
I understand that as a card owner I have the obligation to support the card issuer to keep my account safe, but stopping the usage of my card XXXX times within a calendar month where non of the payments are disputed require your regulatory advise. 
