Is my regulator bad?

[AlwaysWaven]

I just bought a used keezer and think my regulator is bad. When I bought the keezer it came with a 10lb bottle and regulator attached. Everyone who helped to move thought the tank still had C02 in it, but when we opened the valve no air came out of the regulator when we opened the line. So, I sent it to the air shop with a buddy (they close before I get home from work). They said the bottle was near empty and there was something broken in the regulator. So, $25 I had a new tank and "fixed regulator." I racked a saison into a clean keg and hooked the air up. Nothing. So, I played with it for a while and still got no C02 in the keg. I looked at the back and noticed the regulator was covered in frost. So, I closed the valve and purged it (after reading on here). I then noticed that the regulator was at a slight angle, so I adjusted it to straight up and down. I hooked everything back up the next day and had air in the line and it would pour beer. No matter how I adjust things the pressure will not go over about 6 lbs. After a week, my saison is still not carbonated. Thoughts?