We made some scope of work changue but not writed, there was 3witnes when they ask for the changues.

Hi, I installed 10k ft of gutters in Fort Lee defense suply center in Richmond Virginia. Finished few days ago. The scope of work wasnt work that good and we made few changues with the goverment ingenier who was ther but nothing was in paper, just words. At the moment we decide to do few things diferent from the scope of work there where four peoples, the goverment ingenier, quality control person from the company subcontracted me and the superintendent of the job. The guy from goverment ask to the gutter look straight, i told to do that gutters will acumulate water in some points, he say is ok. Now others ingeniers from the goverment want the gutters slope in order that all water get drain. My question: If we go to court and put a case we have a chance to winn? Any change was on paper (changue order) but there where three witness when the goverment guy ask for the gutters look straigh. Thanks 🙏