How to contact steam support ?

[76561199154054921]

They hacked my account, they changed the steam guard first, then the phone number linked to the account, and then the email linked to the account, I already blocked the account to try to prevent any use of it, when I try to select the " they stole my account ", he asks me for an email, I tried to put it but the guy has already changed the account email, the same thing with the password, so I can't get help, I can prove it because I know the passwords and emails previously used, I also have a printout of the purchase vouchers for my account, if anyone knows how I contact steam support like this, please let me know, thank you very much for your help

[Astaroth]

https://steamcommunity.com/sharedfiles/filedetails/?id=1126288560

[Teksura]

Vm$j původně napsal:

he asks me for an email, I tried to put it but the guy has already changed the account email

Why did you not continue the process and hit the button saying "Search with my account name"?