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You need to run a full scan with windows defender and with malware bytes, for them to get access to both your email and your credit card details it's very possible you have a keylogger or something, meaning you changing your details on the infected device won't do anything.
Either way this really doesn't have anything to do with Steam.
Accessed your email but got you card details?
1. what has that got to do with Steam?
2. How would anyone get access to your card information from your email?
what company was used to buy the giftcard? Cause that reads like bought a giftcard through amazon in which case your Amazon account was compromised. Take it up with Amazon.
That means 2 things were compromised. So I'm suspecting you infected your computer with malware, keylogger.
First thing to do is secure your account. Scan the system and change your passwords using a secure device. Phone.
Scan for Malware/virus https://www.malwarebytes.com/mwb-download/
-NEVER reuse passwords, especially on anything sensitive like an email or anything with payment, assume any service where you reuse a password can be compromised at any time.
-Never store sensitive information such as credit card details somewhere unsecure like in a Google doc, if you did and they got access to your email they'd also have access to anything you have saved in your google docs.
-start using two factor authentication on your sensitive accounts such as google and Amazon.