I guess we won´t here anything from the staff about this ...
I opened a support ticket about it, attaching scans of documents, and finally I was refunded the excess by PayPal in July.
Hi all!We apologize for the long wait on the tax refunds. Tax refunds submitted to our Help Center are mostly processed. If you still don't receive the refund, please submit a ticket through here: https://flux3dp.zendesk.com/hc/en-us/requests/new?ticket_form_id=227247, we will review it asap.