Airtastic Play Land interview questions

You go in, sit in the dining area and the interviewers walk around and sit across from you and start the interview. After you’re done, they take you CV and go interview others. I received a call later that day and was given an offer, but I asked for a while to consider the offer as I was given the incorrect rate of pay during the interview. I was not told that I would no longer have the offer if I wanted time to think about it. They told me that it was okay, and ring back if I decide to take up the offer. I assumed this meant I still had the offer but I rang back the day after and was told I no longer had the offer. A little disappointed as I had cancelled another interview elsewhere in order to accept the offer.