creative issue

We are doing a sponsored action on one of our websites for an award that we will give at the end of the year, called the round table trophy https://trofeumesaredonda.com.br/ In the footer of this site, there is a sponsor activation called Mega Chute, We activated this logo via AD Manager in order to measure views and clicks We have made all possible rules so that only this creative appears and nothing from the auction appears, however we were unable to be successful in this regard, many times random ads from the auction appear, can someone help us with any suggestions to avoid this problem?