I recently looked at a caravan on gumtree and agreed to buy it and have it delivered by the owner and left a deposit of $500 as he said it was towable. The next day he called and said he could not deliver it as it had bald tyres and a broken tow bar and would need a tilt truck and it would cost an extra $500 on top of the agreed price of $2000. I said I was not prepared to pay the extra and he said he would put the deposit back in my bank account. Today I contacted him as the money hadn't gone in and he replied to say he would not be paying it back due to the inconvenience and cost of advertising. I explained to him gumtree is free and he will no longer take my calls or texts. Is there anything I can do to get my money back I have a receipt and correspondence through text messaging. Thank you.