First Flight Courier — Important bank document delivered to wrong address

Address:

Bangalore, Karnataka

HDFC Bank had sent important document through first flight courier on 11th Nov, 2013 . I didn't get this till 19th Nov, 2013. After calling customer service, found that document was deliveerd to wrong address. I raised the complaint and they said issue will be resolved in 2 days But nothing happened after 4 days . Still following up with them. Very bad services not sure why banks like HDFC uses this courier servcie