Wipro — Onboarding Update on delayed joinings and no response from helpdesk.

Respected Sir/Mam,
I'm a Wipro velocity candidate and I completed my training in July and have also received my offer letter.
But I am waiting for joining for 6 months now, my joining was supposed to be on 28 Sept but has not yet been scheduled.
The helpdesk is not responding and there's been no update for months now.
I have no idea about what date can I expect for my onboarding. Please give us some tentative date as I have invested my learnings and time for this. Please give some clarification about the joining date.