As far as i know, you are applying for a study visa, so from whichever bank you apply for a loan (RF), you have to deposit a sum of money against the loan the bank will be providing , hence they will provide you with a statement and you have to ask for a letter as well which will state that you have secured a loan in this bank against this amount of money or property you have kept as security, and you can also ask them to mention the purpose you need this letter for. I hope this helps. I personally did not apply but i know that Sindh bank, JS Bank and Silk bank provides these.