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Contact Steam Support is at the bottom of that page
You can still try by selecting the category that approaches your problem the closest and then opening a ticket.
Unauthorised "charges" are covered in the Support Help pages.
That is not something Steamsupport can do anything about, change your password from a secure(not compromised unit) and scan your system for malware.
Valve only change profiles/content if it's violating the SSA, good luck getting them to tell you who, hint, they don't owe you an explanation or to put a name on.
Well you're being vague enough it's hard to say exactly what you're referring to.
But if there was something that violated the TOS on your account they will change it. Also, they don't need to log into your account to change things, they literally have all the information stored on servers that they directly control. Administrator privileges anyone? And they're not going to tell you anything, I mean you're free to demand whatever, I'm just telling you your request is a recipe for disappointment.
And even if someone with admin access was abusing their power they'd just remove that person, that wouldn't give you the rundown about it.
And that's all assuming you haven't compromised your account somehow, which given some of your assumptions seems remotely plausible.
Your account is compromised, fix that. Recover your account properly, and clean up your security.
You are not the one special snowflake that has some particularly different problem - we see exactly this, including the belligerent belief that your system is not the problem or that you have no complicity in this anywhere, literally daily.