And leave them feedback to warn other buyers as well.

Do it now so others that are waiting can see they might be in the same boat as you and will prompt them to look into their purchase as well before he drags it out beyond the 45 day limit to open a dispute.

And in case you do not know as a lot are not aware do not be afraid of neg feedback in retaliation as sellers can not leave negs for buyers.

If they leave a +ive rating with a neg comment you can get it removed and seller gets a slap.