I mean with the info they have from this they can't really do anything credit or ID related. Which only leaves QFF account access or simply more spam and phishing which seems pretty low value all things considered. I personally hold no sentimental value for my number and would rather eliminate one more potential path of intrusion even considering MFA. Speaking of which do they actually verify by MFA when you ring their call centre?I don’t want a new number for my FF account!
And I’m not sure they can do anything with the FF number alone, except a scam text or email. Hopefully most people can avoid those!