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Sorry for the loss. I have been seeing so many complaints about them, and I am confident that they are scam or exit scammers
I don't know if the asicminervalue site is credible enough or not, but I don't even see prominerz listed there (seems to be delisted at the moment).
I don't trust that site at all. They have a habit of listing scam mining gear reseller sites. Like right now, there are so many people complaining about CoinMining Central, and they have it listed there as tested.
Sesterce Mining is confirmed scam yet it's also still listed there.