Your question lacks the full information to answer this question with 100% accuracy.
Type of contract, terms on contract, addendum's, type of financing, disclosures.
The list goes on
I am assuming you do not have a Realtor helping you with this transaction. If you dont,
I strongly suggest you hire an attorney at this point. Your deposit could be at jeopardy.
You could be heading for a lawsuit if you do not perform as per contract.