The protests continued in the tunnel at halftime, with the Cameroon team emerging on to the pitch early for the restart, forming an intense huddle in the middle of the pitch.
Their anger only increased soon after the break when Ajara Nchout took advantage of slack England defending to pull one back with a smart finish from a left-wing cross, only to see it ruled out by VAR for a marginal offside decision.
Goalscorer Nchout was left in floods of tears, comforted by Djeumfa and teammates, with another long delay before the match was restarted.
Clearly unsettled, England had another let-off shortly after as a poor back pass from Alex Greenwood allowed in substitute Alexandra Takounda Engolo, but goalkeeper Karen Bardsley saved her effort.
However, the Lionesses regained composure and from a well-worked corner Toni Duggan picked out Greenwood who fired home on 58 minutes.
England had an unassailable lead with the third, but might have added to its tally, the referee opting not award a penalty after coming to review a possible foul on Fran Kirby in the box by Ysis Sonkeng, thereby avoiding the further wrath of the Cameroon players
There was still time for one more unsavory incident as England captain Steph Houghton was fouled by Alexandra Takounda Engolo, the hefty challenge earning a yellow card, which might have been a red, after a further consultation with VAR.
Houghton had put England ahead in the 14th minute after Cameroon was punished for a backpass, after Augustine Ejangue intercepted White’s cross and goalkeeper Annette Ngo Ndom picked the ball up.
That award set the scene for the further protests, with Cameroon players clearly unhappy, particularly after Duggan rolled it back to Houghton to finish smartly.
Neville pulled no punches at the final whistle, condemning the Cameroon players for their “unacceptable” behavior and claiming the Chinese referee had made the correct decisions over the award of the goals.
“I can’t stand here and say that is fantastic that we are into the quarterfinals of a World Cup, because this is going out all over the world and young girls are seeing this and can be influenced by it, there’s a bigger picture here,” he told BBC Sport.
“I had no sympathy for Cameroon, the rules are the rules.
“Ellen White was onside, their goal was offside and I think in the end the referee has taken pity on them because we should have had a penalty and it should have been a sending off (for the challenge on Houghton).
“The behavior was wrong because this is the image of women’s football we are talking about.”
In his post-match press conference, Djeumfa defended his players, claiming their sense of ‘injustice” stemmed from the award of the 14th minute free kick which led to England’s opener.
“Tonight the referee got a lot of things wrong. Watch the match and you will see her mistakes,” he said.
“The players never refused to play. They were very professional. We played fair,” he claimed.
Djeumfa added: “We came back to 2-1 and again the goal was disallowed by the VAR. I think if that goal had stood we would have had a different outcome.”