Others have said what I would have chimed in with - I would have refused to take it back, would have ignored their calls, and if they pressed would have consulted an attorney - this is completely illegal. In NH, when you sign the papers, both sides sign a document acknowledging the 72 hour right of refusal for the deal for either side, and after that, it's done. Period.... But in your case, I hope you learned from the experience - and that dealer should be avoided at all costs....
In terms of your new vehicle, talking about monthly payments does nothing to tell us what sort of deal you got. If it's a lease, then it's a lease with as little money down as possible with the shortest term. If it's a buy, then you find an online rate calculator for loans and work some numbers to see what sort of deal you'd need to make on a sales price to then create the monthly payments you want to go at. If they're offering 3.9% thru Honda, then plug that number in and get to a bottom line price. That's the ONLY way we'd be able to help you figure out the deal is the price, not the payments.....
