Levle3's IRR db

Whats the best way to get in contact with Level3 to make an IRR change... if your not a Level3 customer? I tried emailing rr@level3.net but that bounces back as an unmonitored mailbox. There are dup IRR entries in Level3's db for my prefixes (legacy from a carrier I used over 10 years ago). My prefixes are in Arin's IRR and I would like that to be the only source. -John