Relax, all your problems should be this big. This kind of stuff happens, you have your records and you'll show the mortgage co. Chances are your payment was posted to the wrong account and may even be fixed by now. Do yourself a favor and have the payments automatically deducted from your checking account, then you'll never have to worry about it. Have done that with my last three mortgages the last being 7 years until I paid it off.
P.S. The person you plan to unload on this A.M. is not the one who created the problem.
P.S. The person you plan to unload on this A.M. is not the one who created the problem.