If you both announce a /24, the BGP route selection process should begin to return some of the traffic to these prefixes back to your AS. Also, if you begin to advertise your prefixes as /24s and as a result, they try to advertise /25s, I would venture a guess that their /25s would get blocked entirely, effectively returning traffic to those prefixes to you. that would be best-case scenario until you can get someone at AS36111 to listen to you.
Best of Luck to you >Upstream requirements. Additionally, I don't believe it would do us any >good. If they're announcing /24 now, why would they not announce a /25.
