yes! thats exactly the type of letter needed, thank you also for your understanding. is it possible that other offices (besides the one next to the airport) dont have the authority to suuply such a letter like you accurately described?
My bank needed a letter from immigration that stated that immigration agrees to open a bank account + a copy of my rented apartment agreement. So tomorrow take these with you +the printed PDF of the Evisa. and go again to the same bank with smile. ask again. if they say "no" go to another branch. smile. untill the bank clerks feels like they want to ...