HDFC Bank — credit card

I am holding HDFC Credit Card. I have to change my mobile no. While, I have made request for the same at HDFC Kamala Mill Branch on Friday 14th June 2019, I have not yet received any confirmation on whether my new mobile no has been updated or not. Because of this, I am unable to reset my card pin. Please help. I even called to HDFC Customer care but not getting any help. Today, I come to know that same is suspended. However, executive didn't revealed reason for suspension. I have recently obtained my housing loan with good cibil score. I am wondering how Bank can suspend card without giving email intimation. My email is same as it was when card was active. Please help