Level 3 GBLX / Legacy Twt IPv6 Issue

I am having an issue where since the the old twt convergence by Level 3 to
the GBLX network/AS3549 our v6 prefix isn't being announced outside of
Level 3. I have had a ticket open for a week and had one engineer who
seemed to be on to fixing it (regarding an export policy) but then that
went silent and now I am getting no-where with support (other than promised
call backs)

Can someone from Level 3 reach out off list and help me out?