To the best of my recollection I was never assigned or at least told one. I was not a customer so when my contact attempts were not ignored or answered with boilerplate, I was asked for my customer details, which I could not provide. No customer details, no support.

The channels to reach you were pretty limited and hard to find when I tried. I assure you, I tried everything short of getting a lawyer to send you paper mail.

I still have the communication history in my archives, but it would be a little effort to dig it out.

EDIT: Found the documentation. My first complaints were in March 2011. At some point I got assigned an abuse ID MU-000B0F55-1:18. In May the issue was still unresolved.