Sorry to hear you're having trouble.
Upon research of this issue I have found that there is indeed an ongoing settlement that has a deadline of December 18. If you are unsure of the sender and do not wish to use the included link then please go here https://www.telecomdatasettlement.com/ where you can check if you're eligible to file and submit a claim before the deadline.
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.