I applied for a South Africa Visa short visit (to attend a meeting in our SA office) since March 31, 2022 and until now i don't have any response.
VFS call centre said they cannot do anything at about it.
Mail and calls to South Africa HC are not being responded to.
I have previously visited SA three times with no issue.

I need my passport urgently for other travels.

Please i need advice on what to do or you can share similar experience on what might be causing the delay.

MOFBISH:
I applied for a South Africa Visa short visit (to attend a meeting in our SA office) since March 31, 2022 and until now i don't have any response.
VFS call centre said they cannot do anything at about it.
Mail and calls to South Africa HC are not being responded to.
I have previously visited SA three times with no issue.

I need my passport urgently for other travels.

Please i need advice on what to do or you can share similar experience on what might be causing the delay.

You didn't have to go to the embassy to apply for South Africa visa. You can apply for an e-visa. Nigeria passport among countries can apply for South Africa e-Visa
https://www.southafricavisa.com/e-visa-south-africa-launch/

You may need to retrieve your passport or the ground of necessity to travel for other critical business exigencies.
For SA, with 9ja passport holders, complete the online e-visa application
-- you should be able to hold on to your passport

MOFBISH:
I applied for a South Africa Visa short visit (to attend a meeting in our SA office) ...
I have previously visited SA three times with no issue.
I need my passport urgently for other travels.
...

Please any update on the delay in visa? It's taking ages for long term visa applicants. One can't even contact anybody to make complain.