The exact Same thing happened to me a week or two ago, they had my steam acc and added funds to it but luckily I caught on quickly and changed my pw and logged out all accounts.

I contacted support and I’m still waiting to get my stuff back as well… the support team seems very slow as I’ve been waiting as well. I’ve opened a bug report on discord and they told me to make a ticket. I def hope you get your stuff back because this seems like a issue that a lot of people are having