"We once again reiterate that any such move would be arbitrary, incorrect and unjustified and would be anti- competitive and against all principles of level playing field," COAI Director General Rajan Mathews said in a letter to DoT Secretary M F Farooqui.
In a bid to enhance the revenues of BSNL and MTNL, the government had proposed that union ministries, public sector undertakings and autonomous bodies give preference to the services of the state-run telcos.
In November last year also, the Cellular Operators Association of India (COAI) had asked DoT not to implement the proposal.
"However, we believe that our request has gone unnoticed and the government is going ahead with the proposal," the letter said.
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The industry body said implementation of the proposal violates Article 14 of the Constitution of India and against various judgements of the TDSAT where BSNL/MTNL have been directed to be treated equally with other private operators.
The state-run telcos had been reporting losses in the last few years. BSNL suffered a loss of Rs 7,884 crore in 2012-13 whereas MTNL's losses stood at Rs 5,321 crore in the same period.