How to contact Blizzard or Cancel your Account?

Interesting. In this time of strife, the phone lines at Blizzard are permanently full. This being the second day that I try to reach someone to change my name (preferred) or cancel my account.

I cannot, however, reach Blizzard on the webpage either. Trying to follow the link from the homepage most of the time leads to a "failed to find this page" error.

Here you are, though: https://eu.battle.net/account/management/wow/

For us Europeans that is the link to account management on Battle.net. The "Cancel Subscription" button is near the top.