Wipro — DOJ[protected], Couldn't reach HR and didn't Onboarding link

My DOJ in wipro was Dec 6th, but didn't receive Onboarding link. Then doj changed by HR to 8th Dec. I waited till 8th but again didn't receive onboarding link DOJ again moved to 15th. Then similarly on 15th it's moved to 20th Dec.

On 20th Dec, I didn't recieve any calls / updates.I tried reaching HR but they didn't pick my call. now I don't know what to do as I already left the job on 3rd Dec to join Wipro.

I have left job once I received this opportunity and now I am without job nearly for 20days hoping for the onboard.
HR said me it's because of the technical issue I was not able to be onboarded