HDFC Bank — credit card

I have been using the hdfc credit card from the past 3 years and am facing a lot of difficulties just in updating the address of my credit card since my signature is not matching. I have called up customer service and was asked to submit a form - when i went to the bank branch for assistance in filling out the form, i was routed to 3 different branches where no one knew the correct answer.in the end i was given a mismatch form for the signature which also required me to fill out the signature as per bank records - which i have stated multiple times that i don't recall. Have tried calling customer service as well, but getting routed through innumerable ivr options which do not solve the issue. Meanwhile i am also being prevented from redeeming the points currently available on my card and i kept getting messages to contact the bank - this is amounting to too much of harassment and very poor customer service