Error pages should provide links to the most helpful destination, or multiple destinations.
A status page option lets the user check if the page is under maintenance, and when functions will be restored.
A brand social media account could let the user know they are not alone in facing this problem.
A return to previous page option lets the user continue their experience for the rest of the website.
A contact support link is nice, but will need some reassuring adornments – so people would actually want to use it.
An error page is generally not a good opportunity to reaffirm brand voice. Resist the temptation!