hi
prepare your job description letter based upon your duties and comparing NOC duties, do not copy and paste. there is duties in your field in 2131 duty list
in the letter your full name, duration with bank, full time employment, job description should be included
take this on company lettter head
signing person name and designation should be there
anyhow you need to arrange this letter as this is must, same issue was with me as I am in MNC and they dont give such letter and after 2 month of followyp i got that. you can take letter from your branch head if he gives its ok. no need form HQ/ HRD