There is not an Apple One Subscription that is $44.95/month, at least in the US. As with any message you get, it would not be recommended to respond by clicking a link or calling a number and providing any personal information. That is the easiest way to have your account compromised.
You can easily see what options are available on your own by viewing the web page here. Depending on what subscriptions you have, it is possible you could save quite a bit of money or gain services that you never had before without paying anything extra:
Apple One - Apple