Bug reports can also be filed in-game in World of Warcraft®. Reports submitted in this fashion will not receive a response. Instead, they’ll be directed to the teams responsible for addressing them.
To report a bug in-game:
Pres Esc or click the ? button to open the menu.
Click Support.
Click Submit feedback or bug report.
Enter the details of the bug into the Submit a bug description box, making sure to follow the guidelines outlined on the submission form.
It seems you can keep repeating it and get the currency atm, I would not abuse that but most people have tried to complete it couple of times to get the quest to clock off.