Check your listing agreement. There's a section that is filled in by your listing agent that states 'if the real estate is sold, leased or exchanged within _____days of expiration of the listing agreement to someone introduced to the property during the term of the agreement' you must pay a commission.
An unconditional withdrawal voids the listing agreement . A listing agreement is a binding contract to sell or lease property. This answer is not legal advice, only an attorney can provide that.
Keller Williams Atlantic Shore
I would be sure to re-read the agreement to see what that time period is and if you signed for any retainer fee paid to the broker.