The World Anti-Doping Agency has been rocked by the resignation of Victoria Aggar, a highly respected member of its own Athlete Committee, who said she quit after Wada broke its promises and failed to protect clean athletes.

The Guardian revealed on Tuesday that Aggar, a retired British Paralympian who has served six years on the committee, was on the brink of going because of Wada’s “spineless and appalling” decision not to issue a blanket ban on Russia.

Echoing the views of many athletes, she also argued that allowing Russians to compete at Euro 2020 – and under a neutral flag at the 2020 Olympics and 2022 World Cup despite a four-year ban imposed on Monday – made a mockery of the system.

But in her written resignation letter Aggar went further still – revealing that Wada had suppressed the voices of its Athlete Committee, which is supposed to reflect the views of thousands of sportsmen and women on anti-doping matters.

“I do not feel that Wada exists any more,” said Aggar. “Too many political games (or machinations), too many conflicts and too much self-interest has led to too many bad decisions, compromises and broken promises.

“Most recently the biggest blow to athletes is the decision by Wada to ignore calls from its very own Athlete Committee for Russia to be banned from competing at the next Olympic and Paralympic Games, despite promising earlier this year to enforce the toughest sanctions available if the retrieved data from Moscow was found to be manipulated,” she added.

Aggar also said that Wada had refused to publish recent Athlete Committee’s statements on its website.

“I am a firm believer that all athletes have the right to an unfiltered voice,” she added. “The concept of silencing athletes is one of the reasons why we are seeing so much abuse in sport and it only serves to reinforce the imbalance of power.

“Events over the past two years have fundamentally shaken my belief in an organisation that I felt initially served a great purpose in protecting the integrity of sport – protecting clean athletes on their journey of pursuing their dreams.”

In accepting her resignation, the Wada director general, Oliver Niggli, responded directly to Aggar. In his letter, he said her claims were misleading. Insisting that Wada followed its policies “transparently and consistently” and underlining that there were athlete representatives on the executive committee and compliance review committee that had voted for and proposed the recommendations on Russia, Niggli also denied athletes were being silenced.

“What is absolutely clear to me is that reasonable people can have differing views; particularly, regarding such a contentious topic,” he said. “I fully respect differing views and, would only expect similar respect from you, without accusations of playing political games.

“As it relates to publishing Wada Athlete Committee statements to the Agency’s website, the last few times that members of the Committee have asked for a statement to be published, the position was absolutely not reflective of a clear majority; in fact, far from it. Case in point, this last time, nine members were in favour of issuing a statement objecting to the CRC’s recommendation, while eight were against and had prepared an alternative statement. Therefore, there was no consensus, and it would have been very strange – to say the least – for Wada to publish two different statements from its own Athlete Committee. In my view, it is simply not correct to mislead in this fashion.”