xender discord omeglemade an oral agreement to pay $200 a month (total cost $1800). When my wife mailed the final payment (certified mail with money order) she enclosed a note asking when the title and extra set of keys would be sent. This was done around 6/21/19. Today she got a letter (non certified) saying "before I send the title out to you I will need an additional payment of $400 for interest owed This amount is still owed due to breach of our contract." Is there anything I can do orwill we have to pay this.