Anonymous on "Contact number update in savings account"

On 3rd dec I requested to update my contact no. by personally visiting the HDFC Branch located in South City II, D-Block Market, Gurgaon Haryana and the lady in branch told me it will be updated in 7 working days.
But post 2 weeks also my number wasn't updated. I called the branch on 17-dec stating the same, they registered the complaint and told me that it will be resolved in 7 working days. BUT ABSOLUTELY NOTHING WAS DONE...THEY JUST REGISTERED THE COMPLAINT....THATS IT.
Again on 26dec I called and they told me we will arrange a call back from branch itself.
on 27dec somebody from the Gurgaon branch called me and told me that they are unable to find the form and they apologize and will be sending someone to get the form signed from me again within half an hour. BUT TILL NOW AGAIN NO RESPONSE....
THIS IS HOW A PROFESSIONAL BANK WORKS....DOES UPDATING A NUMBER REQUIRES A MONTH...
To change a number first bank makes the mandate that you have to visit the branch personally and then bank misplaces the form and except the person to go again and submit the request....