The SPEED-IX is supported by his Partners. Therefore it will be supported by the Partners his normal support desk. Depending the PoP locations you are using, you should contact the Partners his support desk.
But if you have questions about the SPEED-IX in general, or you just need some assistance, fell free to contact us: email@example.com firstname.lastname@example.org. Or call Serverius, they can forward you to the right person.