I'm wondering is it possible to block EPG updates from satellite for some specific SID ?

Let me explain why.
I've built an EPG database for some channel(s) with correct event timings.
However, after it loads my epg database everything is fine untill the channel updates it's EPG from satellite with Incorrect timings and data.
After that, my epg infos are lost, and broadcasted ones are displayed.

Is there a way to block epg for a specific SID?
I found epgcache.h and epgcache.cpp file, but not really shure how it should be done since i have no C++ experience.
Any thoughts?

Thnx for the idea.
I' tryed changing all kind of PIDs, trying to set no update flags, but no change.
EPG is always available from satelite. Only success i had was loosing tone and picture

Any other ideas?