I had the same problem - except mine was scary real. I was on eBay and checked out with Paypal. It failed - which is strange. Then I logged into Paypal directly and it wouldn't show my balance. Then I got the email notification that (4xx)xxx-1234 got added to my Paypal account. Now it turns out that 4 and 1234 (not really) are in my mobile phone number. I thought ok... Then I tried to set up 2FA with this number and sent texts to the number but nothing went through. At this point, my security alarms went off big time. I promptly changed my password and deleted this number that looked like my real mobile number but wasn't. I then added my real mobile number. I got a confirmation text immediately. Then I added 2FA and got a confirmation text immediately. Whatever this (4xx)xxx-1234 number was, it clearly wasn't my mobile number. I feel like I just narrowly avoided getting my account stolen.
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