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If you're sure (and if your bank is sure, apparently, not all banks make this clear either, there is even banks which issue chargebacks but don't know of them issuing chargebacks which would make me want switch to another bank) those are actual genuine charges, you have 2 options
1. Contact Steam support, there's a category "Charge from purchase I didn't make"
2. Contact your bank and inform them of CC fraud. That will get whomever used your CC on Steam in trouble with Valve, but that will also prevent you from using this CC on Steam as well
I am not familiar with credit card purchases but are you sure it is actually steam/valve charging? can't just anyone type in STEAM PURCHASE into the text? especially with scammers
Help > Support > Purchases > I have charges from Steam that I didn't make > Contact Steam Support
https://help.steampowered.com/en/wizard/HelpWithUnknownCharges
See what Steam Support says.