How do I contact support?

I accidentally used a 100m item and want to have it reversed. Can't even find the item in my accessories regardless.

At the top of the website is a Support button. Scroll over it and choose Contact Us. Then click Contact Us Now. You will likely have to log-in to your MS account again to bring up the contact form.

If you mean that you used the 400% Rare Drop Boost item, you likely won't get a refund for it. Let us know what happens, though!