If you are currently a file holder in master city gujranwala, then they require you to update your latest address, even in case of no change.
They have also asked to submit the following:
File number
Name of file holder/name of father or husband
Valid address to receive mail
Cnic number
Mobile/ptcl number
Phone/ptcl number along with name of person authorised/name of father or husband
Cnic of person authorised
This info can be sent to the address of marketing and sales office of master city in gujranwala or you can email it at info@mastercity.com.pk.