HDFC Bank — Salary Account Blocked - Address Change Letter Undelivered

Address: Bangalore

Was trying to transfer money yesterday and it was failing again and again. Checked on netbanking and could not transfer there as well. Today morning got a mail and sms that the address change letter went undelivered so blocking the account.
I have no idea who gave the bank the permission to freeze my funds. Their guy had came for the verification during address change. I failed to get my salary today because of this.
Went to the branch today and a guy came to verify the address but still the account is blocked. I have no way to access my funds. This is an abuse of power by HDFC bank. I want my account restored as soon as possible.