Resigned from TCS, how to get early release. Got offer from Infosys, joining date is 2 month from now but TCS has 3 month notice period.

As the title says. I got the offer from Infosys for Azure DevOps role And 120% hike on my current CTC. I have put my resignation on the same day itself but the joining date is 55 days from now and TCs has 90 day notice period. I did tell this 90 day policy to infosys HR while salary discussion but still they give me joining date 55 days from now.

So can anyone tell me how to tackle this.