strict bandwidth limits?

Hey everybody, sorry if this is not the appropriate place to post this but having searched the forums I am getting the impression bandwidth usage seems to take a backseat to video quality. So I am wondering if i have missed something in setting to keep bandwidth usage for video playback to its absolute minimum.

Before Kodi, on average i watched 30-40gb per month in video streaming.. now with kodi watching give or take the same amount I have had to increase my download limit to 50/mth and I still exceed it… thats a lot of extra $$!

I have set 3rd party addons to 480p, and usually see the sd in media info or 2.0 but sometimes i do see 5.0 and checking my network activity it is clear that it is streaming video at much higher quality.

What settings if any are available for for strict bandwidth limits?

Thanks for any help!