I just received a phone call from this company abo...

I just received a phone call from this company about a gym membership that I have not signed up for. The guy on the phone just told me that "if you don't pay then it will get sent to collections." Then he said that the gym double verifies that the information they sent over is correct but he couldn't tell me how they double verify. I asked if he could give me a number for the gym to call and he said no, then said that if I called it didn't matter because they had all the information now.