Wipro — Asset management system

I am an Ex-employee in Wipro. My last working day is 9th of July, 2022. I had returned all the hardware and ID card one day before my LWD. And I got the confirmation email for that. But after few days I got an email that I still have to submit one asset. I reached out to the asset management team and they informed me that one of the asset is missing and they'll be searching for it and close the issue.
But it's been 2 months that the team is working on the issue. And whenever I contacted them I get the same answer that they will close the issue in 1 or 2 days but that didn't happen. I don't understand why that team is such irresponsible towards ex-employees. I did not my F&F amount and Experience letter till now.

I have registered on Wipro alumni portal but I am unable to log into that portal to complain any issues. Please suggest me any solution for this issue