How can you force the seller of the house out if they are not willing to move out on the agreed closing date?

We have a contract stating the closing date is June 28th. Now they say they can not move out until July 20th. We chose the 28th to accomodate them already. We will be staying with a friend in his basement and our stuff will be in storage. We will have to stay longer and pay more in storage fees if they do not move.
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