AC.Green

Hi, I’m an American with some questions on the rules on some incidents that occurred in my game today. The first happened when I kicked a ball in to the tri zone and chased and was followed side by side by an opponent who lowered his shoulder into me three times on the third I finally fell over, I thought this was illegal but the Sir gave no call. Another thing was when our half-back was going to put the ball in the scrum their half-back was right on his back shoving him and pushing him. There was no call from the sir, I’ve never seen that before in any league so I was wondering if that was against the rules, or more of a respect your opposite thing. Also right before our scrum was going to take the ball out their half rushed in and tried to take him out, I thought this would be an instant penalty since there was contact, but the sir just let him go back. So if someone could let me know if any of these are violations are not that would be great.