..If I read the OP correctly, it sounds as though his complaint, request for advice is more about getting America Choice to respond to his request to cancel the policy. Not so much around their denying coverage or crediting the refund of the policy onto his loan for the RV.
I think the original poster has realized (like so many of us know) that it was a mistake to buy this service contract. Seems he is doing the only thing he can do, which is chalk it up to life's lesson learned, and move on (by canceling the policy and gettting what $$ he can get back from it).
That being the case, the (not very respectful) posts telling the original poster that its his fault for buying this agreement, not reading all the contract, yada yada yada really, really need to stop. They are accomplishing nothing but alienating yet another new member here.
As to the specific issue, of getting America Choice to respond, and get the cancellation done: All I can say is, just keep after 'em, keep pressing, and calling whatever numbers you can find for them until you get a satisfactory response. The squeaky wheel is the one that gets the grease, so stay on 'em like stink on crapm, is all I can say. Hopefully, you won't have to resort to legal action, that should always be a last resort (as nobody really wins but the lawyers when it comes to that).