Cognizant Technology Solutions — Haven't got date of joining after submitting relieving letter

Actually my initial on-boarding date was 23rd July in Cognizant and my last working day in previous company was 25th July. So attended the on-boarding and on-boarding POC told me to wait for new doj.

I submitted my relieving letter in August itself. It's been 2.5 months nearly and no update regarding doj.

On-boardings are happening but still the doj haven't changed in my portal till now. Onboarding POC and recruiter both are not even responding to my mails