Just to add to Marjac and others read the agreement! you may be liable for commision to the agent even after the authority expires.
your agent is under no obligation to cancel the authority unless written in the contract.
There may be a clause where any buyer you introduce personally will not attract any fees
 Use a Jenman approved agent next time and you would not of had this problem (i'm an ex jenman agent)

Just to add to Marjac and others read the agreement! you may be liable for commision to the agent even after the authority expires.
your agent is under no obligation to cancel the authority unless written in the contract.
There may be a clause where any buyer you introduce personally will not attract any fees
 Use a Jenman approved agent next time and you would not of had this problem (i'm an ex jenman agent)