The subject is automatically generated in the request email. In many business situations it's not advisable to change an automated subject or the server on the other side could just disregard your email.
Now I feel like sending another request.
If Gree had organised things a little bit, you could chose between 3-4 different categories and the email would be directed automatically.
Is there any evidence that there are people on the other side picking requests according to the subject or is it just you guys assuming it?
Every ticket is assigned a number and is most probably treated accordingly.
Whether they look at the subject or not, it is in every business situation unacceptable to keep you clients waiting for a week or more.