

As others have said, I would get it written down somewhere asap. In the future, you could ask to have an email sent to you to confirm the date, time, location, interviewers, and any other details like who to contact with questions/rescheduling. Plus they might also share hints like dress code, projected length, and expected types of questions that can help you prepare but might look bad if you explicitly asked for them.
If I was a recruiter, I wouldn’t think less of you for asking for confirmation. Rather, it makes you seem professional and prudent to want to avoid mix-ups like what you just experienced, that you have a legitimate interest in the position, and that you value your interviewers’ time as well as your own. Even if you have a sharp memory, this sort of thing can easily happen just from someone mishearing or misspeaking on the phone.
Good luck with the job hunt. You get better at it with experience, but even then, it’s mostly a numbers game. Don’t let a rejection get you down, every new application is a fresh start with more experience.
Resembles Fetal Alcohol Syndrome to me.