tl;dr
Log in to http://us.battle.net/ (US)
http://eu.battle.net/ (EU)
Go here: http://us.battle.net/support/en/help/topic/wow/176 (US)
http://eu.battle.net/support/en/help/topic/wow/176 (EU)
Click "Continue" then "Submit a Ticket" asking for the refund and the reason why. (if you are willing to wait with your phone, or on the page, the other two options will get results faster)
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100% credit goes to Gothicshark of mmo-champion
First this is not a thread on why to unsub, or even if it is a good idea. It's just I noticed recently a large number of posts by people wanting to refund Warlords over the recent turn of events, and they are unsure as how to do it.
So here is the easy guide.
Step 1:
Log into http://us.battle.net/wow/en/ by now you should have it bookmarked. p.s. if you are not in North America it wont be us.battle.net so make sure to use your book mark and not the link.
Step 2:
Click support
Step 3:
Choose Knowledge Center
Step 4:
Get Help
Step 5:
World of Warcraft
Step 6:
"I have an issue with a purchase or payment"
Step 7:
"I want a Refund for a purchase I have made"
Step 8:
"I want a refund of a copy of World of Warcraft I have purchased through Blizzard"
Step 9:
Submit
Step 10:
Last part I can help you with, you have a choice here.
Any of these choices work, however personally I just submit a ticket, asking for the refund and the reason why. Although if you are willing to wait with your phone, or on the page the other two options will get results faster.
Thank you for your time, and be sure to inform anyone unsure of how to get a refund by using my handy guide.
EDIT 7/6: Added a "tldr"Originally Posted by Numanija (blue post)
Hey there, Game Master Numanija checking in!
Thanks for your patience while we work to reach everyone quick as we can!
We were able to get those upgrades refunded for you, my friend. Please allow 5-10 business days for those funds to return whence they came due to banking processes.
This will also lock the boosted toons until repayment is made, my friend.
If there's anything else we can address please let us know.