Seems odd to me that they will not give the 6mo visa if that is what they are supposed to do.
I have heard of this but have no experience with it.
Write a letter to the BI Commissioner? As slow as things take here who knows? It might take longer than your two month extension to get a reply-if ever. Hope they are not just sending you on a wild goose chase.
If you don't get any usable information here, I'd say a quick phone call to the main BI office in Manila is in order.