Is this common in cases like this?;; Absurd

I went for a consultation, but the doctor didn't say anything about eye correction. The director called me the price. It was more expensive than I thought. I paid a deposit, but something was strange, so I sent a KakaoTalk message later. But it turned out that the price included eye correction; I had no intention of doing eye correction?? If I hadn't used KakaoTalk again, I would have paid for eye correction without even realizing it.. How could this happen? Eye correction is not a procedure that has no side effects;; At least the doctor should explain that eye correction is necessary, or the director only came to see the double eyelid, but the director even wrote down the eye correction, etc. Shouldn't one of the two explain...? Does this happen sometimes?