Wrong Price Listed

I listed a BMW Garmin motorbike sat nav at £245.00.  I received a notification on my phone to say it had sold.  I sent the item to the buyer, but when the funds reached my account I only received £6.61.  I contacted eBay as I am 100% sure I listed the item at £245.00.  They said they couldn’t see any suspicious activity on my account and that the item was listed at £6.61, and there was basically nothing they could do.  Something has clearly gone wrong here.  It can’t be a typo as it just doesn’t correlate.  I could understand if it was £24.50 or £2.45, which would look like I put the decimal point in the wrong place.  This just doesn’t make any sense to me. Why would I put such a random figure down. This was a buy now listing and not a bidding one. I’ve tried to contact the buyer but they are not responding to my messages.  Has anyone else experienced anything like this? I have sold items before on eBay and have never had any issues.