BIG BANK VS.'lil me

What is the name of your state? pa

5 yrs ago , signed a note with BIG BANK for auto purchase.
i have made all 60 payments but the bank says no.
does not appear BANK posted payment #1- which occurred 5 years ago. i do not have records dating back 5 years to provide cancelled check to prove otherwise.
what is my recourse against BIG BANK?
COACHED

[djohnson]

Is your bank account with this same bank? It may take some research but they can pull your check history. Give them a time frame and you can get all your cancelled checks from them. Then go about proving it.