lost documents by bank

Location/place: khammam

Name of company/service: canara bank

Sir,
I have taken a canara bank loan for graduation and paid the amount , when I asked for documents they said we r searching for the documents, and later the bank manager said to take the loan for PG and mean while we will search the document so I have taken the education loan for pg and complited pg and slowly paying the amount but still the document r not avaible and the bank manager has been transvered , and the new bank manager he has written and given that they have lost the document, I need to take education loan for to study in abroad but the bank manager is not giving please tell me what I have to do.