inetnum object change

Hello, I am SSI7-RIPE, AS-8797 mnt-by, wish to change inetnum: 212.28.64.0 - 212.28.95.255 fields. Problem is that previous admins admin-c: RAR4-RIPE tech-c: OVM5-RIPE are retired and I have no contacts with them. This inetnum mnt-by RIPE NCC. Please change mnt-by to AS8797-MNT, so I can update inetnum fields to correct ones. Please send responce to this address or lg@qt.ru, as stated in AS8797 contacts. Thanks. Sergei S. Istomin, INTERSATCOM lead engineer