If you have any in-game issues like losing items from auction house, losing points, being hacked or scammed etc, support is always the ONLY channel to turn to. Keep in mind that posting threads on forums doesn't help to solve the issues.
Follow the chart listed below for reference.
Go to My Page > My Cases > Check Certain Case
After delivering, your case will bear the Pending tag.
If GM read the case, the status will be changed to GM-updated. And you can offer more information by following up the case.
If the case is settled down by GMs or cancelled on your own, the status will be Closed. No one can follow up a Closed case.
Go to My Page > My Cases > Check Certain Case (3rd step in the last image)
GMs will read what you followed up and reply to you later.
Usually, your case will be closed by GMs after all issues are settled down.