DON'T BUY FROM THIS GUY !! HE IS 100% SCAMMER

I was scammed by this guy,
At first time, I bought three Windows 10 Pro retail product keys, but he sent me MAK keys. (anyway its fine, this key worked)
And I bought 1 Office 2019 PP (5pc) key for vouch copy , and it worked all 5 times activation
After that I bought 5 Office 2019 PP (5pc) from this guy

AND IT DOESN'T WORK
ALL OF THESE KEY WERE USED (only 1key worked for 2 times activation)

I sent him videos for prove, I ask him for replacement keys,
but he never answer and blocked me

And I just found now he had bad feedback from many other buyers  

Please look at my screenshot, I'm not lying
https://i.imgur.com/G8uDfqd.jpg
https://i.imgur.com/ruzIN9x.jpg

DON'T BUY FROM THIS GUY !! HE IS 100% SCAMMER