They claimed that instead of agreeing to their demands for which the ex-servicemen had been agitating for long, the Centre was "insulting" them.
The war veterans said the government was doing "injustice" by capping at Rs 10,000 per month the educational assistance it gives to children of martyrs or those disabled in action.
"By not implementing OROP, the Modi government has betrayed our trust," said Major General (retd) Satbir Singh, chairman of the Indian Ex-Servicemen Movement.
The Modi government "insulted" ex-servicemen and their widows by arresting them and suppressing their protest using police, he alleged.
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"It has become a hallmark of the Modi government to suppress opposition voice. We would like to ask the BJP government at the Centre as to why it did not accept OROP in the form it was accepted by the then UPA government on February 17, 2014?" he asked.
"Why the Modi government did not accept OROP in the form accepted by the UPA government based on the theory of equality, thus denying benefits to ex-servicemen?" he asked.
"The Modi government denied benefits of OROP to 40 per cent of the armed forces personnel and those who retired early, according to a notification issued on November 7, 2015," the retired officer said.
"Why is injustice being meted out to the children of martyrs by limiting their education expenses at Rs 10,000 per month?" Singh asked.
He was referring to a Centre's notification dated September 13, 2017, capping education expenses for the kids of martyrs or those disabled in action at Rs 10,000 a month.
In November 2015, the Centre issued a notification, brining into force the long-pending OROP scheme, which it said, will benefit over 2.5 million veterans and war widows.
In December 2015, the government appointed a committee to look into the anomalies, if any, arising out of the implementation of the scheme. The panel later submitted its report to the defence ministry.