Just playing devil’s advocate here, but I’m wondering on what grounds you would try to have the meeting declared invalid. It sounds like the chairman was nit-pickingly precise in addressing the rules (although I’m confused about which motion was allowed and which was struck out).
I don’t think you can get a meeting overturned just because it was badly conducted (there are no set standing orders for meetings, more’s the pity). If someone who should have been allowed to speak was silenced, or votes that should have been counted weren’t, that’s a different thing.
Having said that, the 24 hour rule on proxies only applies to large strata schemes. Does yours have 100 lots or more? If not, the proxies should have been counted and that would be your grounds for having the meeting overturned.