You do not necessarily have to call them and yes one should NEVER click a link from your email, however you can go to your paypal account via your web browser and log in that way.
If it isn't from paypal you will be able to log into your account and if it is, and I seriously doubt it would be, simply because paypal DOES NOT SEND OUT SUCH EMAILS.
If there were a problem with your paypal account you'd know the next time you tried to get into it via the internet and using your web browser to do so.
Key is to real PayPal rules and know what they will do or won't do regarding making contact with us by email and this type email is one thing they would not do. They would not ask you to click on a link in the email but rather ask you to go to there site and log in from there.