Palm Beach RV

I bought an RV Sunset from Palm Beach RV, Inc. for my business on 11/15 after a demo from Rob the salesman. I paid $30,226.06 and it was delivered to my home on the same day by ***. On 11/19, I noticed water leaking from the AC connection from the ceiling due to rain. I immediately called Rob and ***. Rob said someone would come over on 11/20. Alex and an assistant from Palm Beach RV arrived on 11/20 to check the water leak and said it was extensive and couldn't be fixed. Alex said they don't check the AC when prepping the RV's, only the lights and pumps. The RV was returned to the company location with the approval of Palm Beach RV. I asked for a refund, but the manager said no and offered another RV. I agreed to get a Winnebago *** 2018, but Rob said it would cost $2000 more and be delivered on 11/27. Later, Rob called and said it would cost $4000 and be ready on 12/04. I feel trapped and want my money back. He lied about the cost. Please help me.