A lot of variables here not being discussed.

• I'm assuming your using their router? If not then it would most likely be an ISP issue.
• Is it signal to the cameras? That would be fixed by a mesh but absolutely no way you should ever buy that from an ISP.
• If they have signal and work inside the house then it's a router config and as others have said Fidium is unlikely to be of any house. Port forwarding can be dangerous if you don't know what you're doing.

99.99% chance you'll be better off getting someone who knows tech and not dealing with Fidum.

Where are you that they actually hooked you up? I'm in Concord and they have gone around our street but not actually run fiber yet (although they keep leaving us notices that it's happening since July).