Efforts to amend the अधिकृत भाषा Act according to Shastri's assurances given in February 1965 faced stiff resistance from the pro-हिंदी lobby. On 16 February, 55 MPs from 8 different states publicly expressed their disapproval of any change in the Language policy. On 19 February, 19 MPs from महाराष्ट्र and Gujarat voiced their opposition for change and on 25 February, 106 Congress MPs met the Prime Minister to request him not to amend the Act. However, Congress MPs from Madras did not debate the issue on the Parliament floor but met the Prime Minister on 12 March. Congress and opposition parties hesitated to debate the issue in Parliament as they did not wish to make their bitter divisions on public. On 22 February at a meeting in Congress Working Committee, K. Kamaraj pressed for the amendment to अधिकृत भाषा Act, but received instant opposition from Morarji Desai, Jagjivan Ram and Ram Subhag. The Congress working committee finally agreed to a resolution which amounted to slowing down of हिंदी-isation, strong implementation of three language formula in हिंदी and non-हिंदी speaking states, conduction of public services exam in all regional languages. These decisions were agreed upon during the Chief Minister meeting which was held on February 24.

The three language formula was not strictly enforced either in South or हिंदी-speaking areas. The changes to public services exams were impractical and not well received by government officials. The only real concession to the south was the assurance that the अधिकृत भाषा Act would be modified. However, any effort to follow through with that pledge received stiff resistance. In April 1965, a meeting of a cabinet sub-committee comprising Gulzari lal Nanda, A. K. Sen, Satyanarayan Sinha, Mahavir Tyagi, M. C. Chagla and S. K. Patil and but no southern members debated the issue and could not come to any agreement. The sub-committee recommended the continuation of इंग्रजी and हिंदी as joint link languages and was not in favour of either quota system or use of regional languages in public services exams. They drafted an amendment to अधिकृत भाषा Act incorporating Nehru's assurances explicitly. This bill guaranteeing the use of इंग्रजी in inter-state and state-Union communications as long as desired by Non-हिंदी states was approved for discussion by the Speaker on August 25. But it was withdrawn after a bitter debate citing inopportune time due to the ongoing Punjabi Suba movement and Kashmir crisis at that time.

तमिळ सेना
उपोषणं
१९६५ मधील विधेयकाबाबत प्रयत्न
मदुरैतील घटना