Given what the OP said, she had been outed by the sales person. Therefore, she likely will never be able to shop that client again. At that point, I think it's perfectly ok to demand the phone back, first in a quiet but firm voice then, if necessary, start increasing your volume and demanding to see the manager.
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Have PV-500 & willing to travel.
"Answers are easy. It's asking the right questions which is hard." (The Fourth Doctor, The Face of Evil, 1977)
"Somedays you're the pigeon, somedays you're the statue.” J. Andrew Taylor
"I have never met a man so ignorant that I couldn't learn something from him." Galileo Galilei