Thank you for contacting the World of Warcraft Game Master Department.
Currently, we are aware of an issue where bank bags that were purchased before the patch are no longer being displayed. Our teams have already worked to resolve the matter and bank slots should now be shown as they previously were. In order to assist you further, I have ensured that the correct amount of bank bags have been purchased as well as refunded your character for any amount of gold you may have used in purchasing new bank slots.
Should you require further assistance, please submit another help request the next time you are online. We hope you continue to enjoy your experience in World of Warcraft!
For any game play questions, please refer to our site at http://www.blizzard.com/support/wowgm/
Thank you again for contacting us and your understanding in this matter is greatly appreciated. I hope that you continue to enjoy your experience in the World of Warcraft!