There’s a chance the person you’re talking with at the company doesn’t have the power or authority to help you in the way they made it seem like they could.
And instead of admitting it or passing you up the chain, they just stall and try to get rid of you as smoothly as possible.
It’s not about trying harder to turn their No into a Yes. The Yes just isn’t possible with this person despite how nice they are or how well intended.
Learn what you can and move on. Work to get in rooms with the real decision makers.