Studio 2015 FL active license expired.

Hi,
I bought Studio 2015 FL 2 months ago and have been using it since then without a problem. I opened it today, and it says my license has expired. I go to my SDL account and it says there is one license in use. When I copy/paste the code into the activation field, I get an error saying 'Activation failed. Activation not allowed as remaining quantity is 0.' I cannot get into Studio at all now.
I've tried to submit this to support.xl8.one but get an error when I click 'Submit Request'. Is there a phone number I can call? I am located in the Netherlands.