Odometer reading for a used car purchase

Hello, last night my husband and I purchased a vehicle and realized none of the promises made it to paper, so we started questioning the sale. Later, we found the odometer reading on the title paperwork to be incorrect. Despite the fact that this was an "as is" purchase, I believe I have a case for small claims in the event they do not issue a refund. My requests to speak with managers today have proven unfruitful, although they are documented. I wonder whether or not my husband's signature on the odometer reading validates that he did see the actual mileage of the vehicle. Does it constitute an inaccurate mileage disclosure if he agreed? Aside from that, the circumstances surrounding the purchase of the vehicle I believe, render the "as is" disclaimer ineffective. He was signing papers at 10:30pm in his second language. Knowledge is power. Can you help me? I am willing to pay for counsel. Thank you, Tess