I sent them an S2 blade back from the US, via their UPS account. Total travel time was about a week, and I had an email thread that they worked with me in a few times. Your situation doesn't reflect my experience.
Where did you ship from, and has the part made it back to them?
I sent it back from New Zealand to their China office. I used their account and ive emailed a contact person there, it took them about 10 days to apologize for the delay but doesnt bother answering my rma query, and that was 3 days ago.
Speak of the devil.... just got a reply with tracking number for returning parts but over 3 weeks is still a bit long.