The 26-year-old, who won gold at the Delhi 2010 Commonwealth Games, lost his last 16 bout against Britain's Tom Stalker 20-16 but appeared to be on the wrong end of some dubious judging calls as he lost an extremely tight second round by a surprising four-point margin.

India's two other boxers at the event also crashed out in controversy as welterweight Vikas Krishan beat American Errol Spence 15-13 before the result was overturned by the International Boxing Association (AIBA), while light heavyweight Sumit Sangwan lost a closely contested bout 14–15 against Yamaguchi Falcão Florentino of Brazil despite many at the ringside feeling the Indian had won.

Kumar (pictured top) openly accused AIBA of cheating after the bout at ExCeL and has continued his attack after arriving back in India.

"I was clear winner, but the judges didn't give me points," Kumar said.

"It seemed that everything was already fixed.

"I told the local press in London that it was not an Olympics, it is just a district-level tournament because nobody expects such blatant cheating at this level of competition.

"Sumit Kumar [Sangwan] and Vikas Krishan were judged wrongly too even as we all had scored well against the opponents.

"The English are just prejudiced and in a habit of oppressing their opponents."

Initial results at London 2012 said Vikas Krishan (right) edged out Errol Spence (left), but Spence appealed the verdict, and won. The match decision was overturned, with two penalties awarded to Krishan, and the final score standing at 13-15 in favour of Spence.

After Krishan has his result against Spence overturned, the Indian team went to the Court of Arbitration for Sport (CAS) but it was immediately dismissed as he was forced to settle for AIBA's decision.

Despite the criticism from the Indian boxer, AIBA has defended their judging out bouts.

"Our main concern has been and will always be the protection of the integrity and fair-play of our competitions," said an AIBA statement.

"We will take all possible steps to reinforce this."

In their commitment to transparency, AIBA expelled boxing referee Ishanguly Meretnyyazov of Turkmenistan, who was in charge of the controversial last 16 Olympic bantamweight bout between Azerbaijan's Magomed Abdulhamidov and Japan's Satoshi Shimizu.

Meretnyyazov was widely criticised after Abdulhamidov hit the canvas six times in the third and final round but was still declared the winner as the referee refused to disqualify the Azeri despite his obvious attempts to waste time.

Both Abdulhamidov and Meretnyyazov were heavily booed by the crowd at ExCeL following the result but a subsequent appeal from Japan to AIBA proved successful and the result was overturned before Meretnyyazov was dismissed.

AIBA's international technical official involved in the bout, Aghajan Abiyev of Azerbaijan, was also expelled "following a number of breaches of the AIBA Code of Conduct".

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