Cognizant — didn't receive my doj

I got my offer letter from cognizant on 17th december, 2019. I haved uploaded all the documents on cognizantone portal within a week. Got my "pan details approved" mail from [protected]@cognizant.com. But it's been 7 months, i still didn't receive my date of joining. I sent a mail to the recruiter and even the hr but didn't get any reply from their side.
I am a 2019 batch and my one year of work experience is getting wasted.
I am eagerly waiting for my date of joining. Please help me and update me as soon as possible.
A message from cts side will help me to revive my hopes.

Regards,
Dipsikha roy
Candidate id[protected]