Sorry to read about the problems with the coach but buying sight unseen, even from a dealer, is very risky and it appears this time the out come was not good for the new owner. The day when a merchant would live by their spoken agreement has long passed. Expressed or implied post sale warrantee period ends at the dealership curb. It you don't have it in writing, with a signature, your options maybe very limited. Since each state has different consumer protection laws you need to education yourself on what options are available.
In the mean time get the coach home or where you keep it and stop the storage costs while you are working this out even if it means going deeper into debt. Keep records of all costs and the time periods the coach was not usable for potential legal action. For the moment any dealing with the dealership do not mention legal action. Once you pull that trigger most merchants will shut you out and just wait for the summons.