My use of the term "contesting" referred to your rejection or disputation of his assertion that he had established residence before he got his drivers license. He certainly should have done so sooner, but I expect it's common to postpone amongst recent arrivals or even returning residents.
From Merriam Webster:
Synonyms and Antonyms of disagree
     to have a different opinion <the leader thought we were still headed north on the trail, but I disagreed>
Synonyms: differ, dissent, nonconcur
Related Words: clash, collide, conflict, contrast; counter, debate, object, oppose, protest, resist;  CONTEST; dispute; argue, bicker, fall out, quarrel
Phrases: take issue