youdontknowme, sounds like this specific Shadchan is a very rare breed- a one girl Shadchan. If you’re a 5′ 5″ guy, or a unique personality- type, for example, or some other hard-to-fit situation, maybe the Shadchan doesn’t know any other girls who fit the bill. There are lots of Shadchanim. Why deal with one who makes you feel uncomfortable and doesnt take no for an answer?
But truthfully, many happy Shidduchim have happened with a little coersion in the beginning.