Check out today's hot buys. Inspect the label to confirm that it is indeed the wine you ordered. If it is an old wine, check that the ullage is reasonable. Do not accept wines with corks that jut out above the rim of the bottle.
Chances are that a spell of heat caused the contents to expand and push the cork out slightly.
Ask nicely for a replacement. Dealing with the cork After removing the cork, the waiter will hand it to you. In the old days before bottle labels came about, proof of a wine's origin was via the cork which chateaux had branded. Do not chew it, place it in your ear or otherwise. Smelling the cork and handing it around the table for others to do so is like kicking the tires of a car you are contemplating to purchase.