You have a right to request a formal rejection of your offer by the seller. There is a place on the signature page of the C.A. R. Offer where a seller can reject an offer in writing. That's a reliable way to alleviate your concern of whether the Seller saw your offer or not. If the agent doesn't cooperate with your request, you have a better basis for your complaint. Finally, many reputable agents will not represent both the buyer and seller just to avoid similar conflicts of interest or even the presumption of it. Hope this helps.