Trending @Infosys; How to get 1 day waived off from notice period

I am a specialist Programmer in infosys. I got an offer and I put resignation. The last working day falls on Sunday, due to which e-separation portal is showing it as Monday. The new organisation considered my LWD as Sunday and gave me start date of Monday itself.

I talked to my project manager and they agreed to release me on Friday itself.

Now after HR validation, HR changed the approver to my MU lead. MU lead told me to contact HR for any date change, he can't change the date.

I am trying to reach out the HR, but isn't replying on my mail or teams message. What can I do now. It's a matter of just 1 day, that too, Monday. Even if new organisation agrees to let me start on Tuesday, I have to relocate, so I wanted to relocate over the weekend.

What can I do now. HR isn't responding.