Accepted Offer now wants to look at car

Hi everyone, just wondering what I should do and how I report a seller to Trade Me - I have a car listed, the guy offered me a price I was happy with yesterday and I accepted.  Then got the email from Trade Me - Congratulations you have sold your vehicle.  Once I contacted him through email, the buyer then said he wanted to meet yesterday to make sure it was okay before he paid.  Managed to get a cell phone number so gave him a call, said he would get back to me with a time later in the day as I was at work.  Didn't hear from him, finally got him to message me, and he said that yesterday now didn't suit and he would contact me next week.  

My question is - he made an offer and I accepted it.  Shouldn't he have checked it all out before making the offer??  On looking at his profile, he only has 1 feedback which is negative and seems he's done the same thing to another trader.  Any suggestions??  And also, shouldn't Trade Me be notified about him so that they can remind him of the terms of making an offer?  Any advice you can give would be great.  Thanks.