Technical Resignation was not accepted

Sir, I tendered my Technical Resignation to the Department of Post on 22.11.2021 to join Income Tax Department as Stenographer Gr.II (2400grade pay) but my Technical resignation was not accepted. I was told to produce a letter of intimation in which if I duly mentioned 2400grade pay or not. I did not mentioned about the specific 2400gp in that intimation letter but as per the Office Memorandum(Copy Enclosed) of DoPT No. 28020/2/2018-Estt.(C) of Master Circular on Technical Resignation there is nowhere written about any such ground of Grade Pay, in fact the DoPT OM says that any employee who is going to join any other Central Govt. department through proper channel will be given Technical Resignation and Pay Protection even if the employee is going to join a post of lower grade pay. The Department of Post made the arbitrary ground of "Grade Pay" and did not even went through the DoPT OM of Technical Resignation and denied me of giving Technical Resignation. As per that DoPT OM I am entitled to be given the Technical Resignation along with Pay Protection and counting of service length. I joined Department of Post on 02.04.2018 and gave almost 4 years service and eventually I got harassed and was not given Technical Resignation. I joined Income Tax Department on 28.02.2022 as a fresh employee and my previous 3 years and 10 months service length was not counted. I am deeply aggrieved with the whole process. I hope I shall be given pay protection. Kindly look into this matter. Request, intimate as to whether I am eligible for pay protection and other benefits on Technical resignation or otherwise?? Please provide details of court cases similar to my case.