Madrid lost further ground in the La Liga title race following Sunday's 2-0 defeat against visiting Sociedad at the Santiago Bernabeu, where Vinicius Junior was denied a penalty and Lucas Vazquez saw red, goal.com reported.
Vazquez was shown a second yellow card with Madrid trailing 1-0 in the second half before Vinicius went to ground after seeming to beat Sociedad goalkeeper Geronimo Rulli to the ball.
Ramos did not hide his disgust post-match, hitting out at Spanish referee Jose Munuera and the lack of VAR used in the capital.
"The referee played a big role in things. I've always defended the VAR system, but it has to be improved because what we've seen was scandalous," Ramos said.
"He could have awarded the penalty and then consulted the VAR. After seeing the penalty incidents in the dressing room, all we ask for is fairness. There are times when we're punished for our behavior on the pitch and the referees' committee should do the same with the officials. The VAR is in place but you've got to know how to use it and consult it.
"We're motivated and fighting for a La Liga title that'll be tough and it's made all the more difficult when things like this happen. When you're out there on the pitch it's so much more difficult because your heart is racing. As the team captain, I always try and help the referees, but tonight's performance was scandalous.
"Lucas Vazquez's sendingoff was very harsh. Never before have I seen a player shown a second yellow for something like that, where you're in the middle of the pitch with three Real Madrid players around you."
Madrid had the chance to move level on points with third-placed Sevilla, who drew 1-1 at home to Atletico Madrid, but goals from Willian Jose and Ruben Pardo left the Champions League holder languishing in fifth and 10 points off the pace.
Luka Modric said Real Madrid's problems are not normal, though he defended under-fire head coach Santiago Solari following Sunday's defeat.
Dissecting Madrid's woes, Modric said, "Missing goals and more unity on the field. At home, they're scoring goals on us and we aren't scoring many.
"We have to sit down, talk and to see what is our problem. It's not normal, it's not just one time, this has happened many times. You have to find solutions, lots of players are not performing at their best.
"I have to improve and assume more responsibility. It's a difficult moment for the club but these things have to unite us more."
With pressure mounting on Solari – who replaced Lopetegui in October – Modric added, "The manager is doing a great job but he can't score the goals or stop them at the beginning of the game. He has hope, but we are out there on the field and we have to do better to have more concentration.”