Never heard of this I also tried to search here on the forum but no one mentioned Sazmining I tried to check their site in the whois and it seems the website was registered in 2018 but why I didn't heard them from some people here?
I also checked their old posts from reddit it seems they are offering a mining rig for $99 to start mining Bitcoin that's really suspicious there is no ASIC miners that you can buy with $99 maybe you can buy broken and old units with this amount but it's still really suspicious.
If I were you better stay away from them if you don't want to be a scam.
Check the reddit that I found below they deleted the first posts of some reddit users that tells their business is scam.
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https://www.reddit.com/user/Sazmining/comments/w3qooi/sazmining_is_the_leading_turnkey_bitcoin_mining/