we are still in past century. Bankers' are still not climatized to electronic correspondence. They are afraid of using it because their written english communication skills are below average.
i recommend:
a. write a letter to bank branch with details of document you require against your account / or whatever. last line shall be, Incase am not supplied with the required data pertaining to my request, I will be approaching the state bank of Pakistan and banking mohtasib lodging a former complaint against this branch.
b. get that letter stamped received manually.
c. wait for 3 working days, and revisit the branch and you will surely get the required paper., if not
d. write a letter to zonal office ending with same lines but instead of branch mention zonal office, address to Vice President (without naming any department), complaining about your issue, attach a copy of letter received by the bank branch, dispatch that by courier.
e. you may receive a call from branch or required document by courier mail, wait for 5 working days. if no response arrive
f. compile the correspondence and lodge your complaint with State Bank with a copy to banking mohtasib
Thats' the process to address such issues.
correspondence means 'hardcopy letters' not emails. 
