seiren mini mic thread is incorrect. it is 1/2 inch not 5/8

I got the RZ19-0345 seiren mini mic. It was described as having a standard 5/8 inch thread. I got a boom arm stand for it that supports all standard thread sizes for mics, 1/4 inch, 3/8 inch, and 5/8 inch. Turns out, this mic's thread is more like 1/2 inch. It doesn't fit even close to the others, and I've been googling for a thread adapter that has a 3/8 inch female end and a 1/2 inch male end, but I can't find ANYTHING because no one makes mics with 1/2 inch threads, so there are no thread adapters for it. Thinking I will demand a refund or replacement but I bought this in 2023 so it's unlikely anything will come from it.