If it's your bank, it should be easy. When I asked for my account and routing number for my checking number from a chase branch, the teller incorrectly assumed the routing number was for the current state when in fact i opened it in another state which meant a different routing number. Come my first direct deposit and I see nothing in my checking account, I panicked, guessed the problem looking at the routing number the teller gave me and where I opened it, went to a branch and they fixed it in like a day.