Where do I go to get a 60-day COVID extension after my Non-IB visa and work permit are cancelled?

The ONLY people who go to the Muang Thong Thani Immigration office for their extensions (covid OR otherwise) are people who originally entered the country on visa exempt OR tourist visa entries.

IF you had another type of visa/extension (marriage, retirement, working, education etc you go to Chaengwattana for your covid extensions

AND that holds true if you used the One Stop Service Center at Cham Churi Square for your visa/extension (BOI or IEAT etc)

you cancel your extension at Cham Churi and then go to Chaengwattana to get your covid extension Cham Churi doesn't fool with covid stuff for anyone.

You cancel your extension and work permit at OSOS at chumchuri, then go to Chaengwattna for Covid extension.

What visa did you use to enter Thailand?