I get these kinds of e-mails a fair bit. Whenever anyone dares to either ask to know what lenses are loaded in the phoropter, or not be overcorrected, or not get their kids glasses, so often they get really disrespectful interactions from the lens-seller.
Remember, they run a FOR PROFIT BUSINESS selling lenses. They’re not scientists, they’re not trained to understand the myopia inducing effects of myopia, many of them are simply lens sellers. Don’t let them bully you into BUYING things from them.
If anybody treats you disrespectfully or tries to silence you when you have QUESTIONS about the process, just get out of there. You’re the customer, vote with your wallet.