What agent could do to change your mind?

You have a duty to represent the prospective buyer as much as you would represent the seller. You were rude. You were obviously prejudiced. It has been a thoroughly unpleasant experience having to deal with you throughout the dealings. The vendor lost a potential buyer just because you were unbearably patronising and unpleasant and unwilling to discuss your prospective buyer's offers. You were unethical in not discussing offers and feedback to the vendor. You did nothing to instill confidence in me, as a prospective buyer. You worked very hard in chasing me away for reasons known only to yourself but I would conclude that as prejudice. You must pick up your companyjob description of sales negotiator and actually understand the spirit of the job and be a little more warm and welcoming of your clients.