In a non-FAA checkride (PC, LOFT, not an ATP ride), you get '3 strikes' or train to proficiency items. (Most carriers do this. I think it's part of the AQP/IOSA environment) If you mess something up, you go back and do it again. Can do this up to 3 times per ride. When you messed up what you did, were you allowed to go back and do it again to correct the issue, or did they just fail you?

If it's the latter, go to your union's training committee, explain everything and get guidance from them. Likely, since it's over, nothing can be done, but if your LCA did you wrong, his/her actions can be corrected for the future.