Hi Denis, Convenient as it may be to use a LIR and their historic provided prefixes, have you thought about starting with a clean slate ? If the company was close to bankrupt and one can only assume that it didn't require a couple /16's and a couple /19's ... Didn't you get ANY questions from RIPE in that regard when you discussed the topic with them ? The reason why those prefixes where provided isn't valid anymore and if you are restarting the business even a /21 should be enough ... Even in Russia a will take some time to get the customers back, especially if they have been offline for some time. (If they where not offline, the prefixes wouldn't have been hijacked correct ? ... ) Next to this all, none of the prefixes that I currently see under the stated AS have a route-object in the RIPE db and the AS object AS31733 isn't updated since 2008, as none of the listed AS's there are current / active upstreams / peers.
From where I stand it doesn't surprise me that your upstreams don't want to advertize it and if they would, don't be surprised if some networks filter your prefixes regardless if you are listed on a shady list on Spamhaus.
Regards, Erik Bais