How is this possible?

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I went to CVS pharmacy last week. Wasn’t sure if I had their ExtraCare card or not so entered my phone number during checkout. My number was accepted. When I was done paying and clicked to print the receipt the email it showed me wasn’t my own, which I found weird. When I got home I created an online account on the CVS website and entered my phone number and email to look up my ExtraCare account. It gave me an error message: Incorrect info. Info entered doesn’t match our records. I thought maybe I never signed up for the ExtraCare card so decided to join. When I did that I got a message that I already have it. Tried to look it up again using my phone number and email but got the same “incorrect info” message. I called the ExtraCare number and told the representative what happened. When she tried to look up the account on her end she said that phone number is associated with another account. How is that possible? I’ve had this mobile phone number for many years. Something isn’t right. She tried to create a new ExtraCare account for me on her end and it worked. I was able to successfully link it to my online account. While it’s great that I now have an ExtraCare account the card will only arrive in 3-4 weeks. I have a feeling that if I shop at a CVS location and don’t have the store card on me, entering my phone number may still bring up the other account and not mine.