just got robbed of over 500 plus gamerscore that didn't add up.

As long as you are connected to Live your save should br synced with the Cloud.

so go into account and remove accounts that way?? will it get rid of any of my saves like dark souls etc??? because if it deletes saves i don't really want to do that. also delete the account then do a hard reset then add the account back?

Yeah I was online when I earned the achievements. I was also online the other day, about a week ago. it shows I have completed the game on my card, but it doesn't actually add to my gamerscore. only about 500 of the thousand counted earlier.

have you tried contacting support to see if they can resolve the issue

exactly what game? used some trick (since some games that allow them like crash ctr, block getting the achievements when you use tricks), some games may take time to reflect the scores