I presume you paid what you thought was the correct price for the home. Realtors can tell a buyer if they have other offers and if those offers are at, below ,or above list. It is not customary for realtors to tell buyers exactly how nuch the other offers are.
You would have a hard time proving this case. Did the realtor provide you the amount of the other offers in writting? If not this could be a case of he said she said.
I hope you are happy with your home, and if you got it at or a little below market value you are in great shape.
Best of Luck to You.
Kawain Payne, Realtor