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I am sorry to hear this.
Your next step should be to send him a demand letter threatening a lawsuit. Set out the facts, demand a full refund plus damages and provide a deadline. Tell the seller you were materially misrepresented and if you don't get the refund you will commence legal proceedings for the refund, higher damages as you will also sue for loss of enjoyment of the summer and inconvenience, interest and your costs.
You can sue the seller in Small Claims Court and can self-represent and if it gets that far you can always post on this site again and I can assist you further if you find you need some help as you go through the process.