Sorry this has happened - I would be a bit upset if I made an offer and then heard nothing from the seller for a few days especially if there were a couple of auctions for the same item I was either watching, bidding on or had made an offer on.
Maybe next time you could do as Jenny70 suggested and make contact just confirming that the offer has been received and you are considering it and will get back to them in the next day or so.
Maybe next time you could do as Jenny70 suggested and make contact just confirming that the offer has been received and you are considering it and will get back to them in the next day or so.