Online Help

Blizzard Entertainment Customer Service

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First go to https://eu.battle.net/support/en/help/Select the topic then click "Submit a ticket"

In general, help is available at this help page for: customer problemssupportcustomer careissuesquestionsbillingsalescustomer service

This page by the numbers

avg response43 mins
available24 hours, 7 days
SERVESBlizzard Entertainment Customers
RANK#1 help page
RANK OVERALL#4 overall