Thanks guys i got it working, posting solution might it help some1 else like me.
if mounting permanently via fstab use these commands
//srv02/symtest /media/data cifs uid=33,gid=www-data,credentials=/root/.smbcredentials,file_mode=0777,dir_mode=0777,sec=ntlm 0 0
uid = 33 > www-data ( u can get the id of any user by typing "id www-data"
file_mode and dir mod is like chmod
restart is necessary "sudo mount -a" wont change anything
i also changed the owner and permission in web folder "symlink" using "sudo chown -R www-data:www-data filestore"
cheers