HCL Technologies — Incorrect last working date is mentioned on my experience letter

I'm an Ex-employee, my employee ID is 52159124

I resigned and left HCL on Apr 4th after informing my manager and submitted all my assets on that day. I didn't serve the notice period of 3 months.

After some time of leaving the company, I got mail from HCL that I needed to settle my dues by paying the notice pay recovery amount to them which I've paid now but the experience letter which is uploaded on the HCL offboarding portal is showing my last working day as Jun30th instead of Apr 4th.

I've been trying to chase HR to correct my last working day on the experience letter, but they are not responding.

My point of contact for HR's - VISHAL.[protected]@hcl.com
monica.[protected]@hcl.com
[protected]@hcl.com

Kindly help me as I need to show this experience letter ASAP to my new employer or else, I'll lose that job opportunity.