A chargeback typically occurs when someone disputes a payment through their bank. As a result, the funds are returned to the individual's bank account.
This is usually because unrecognised payments are identified on the individual's bank account or because they are made aware of purchases that were made without their consent.
Sometimes, users may accidentally request a chargeback rather than a refund for a purchase they've made.
Steam
What happens to my account when I raise a chargeback?
When a chargeback is requested for a payment made through Steam, the account the purchase was made on is restricted to prevent possible further unknown charges. These restrictions usually involve limiting access to disputed products/games until the disputes are resolved.
My Steam account has been restricted due to a chargeback. How do I resolve this?
If you raised a chargeback by mistake, or are unable to access a product/game on your account, the quickest way to resolve this issue is to reverse the chargeback with your bank. You should be able to do this by contacting your bank.
Remember it can take multiple weeks for a chargeback to be reversed by your bank. Once the funds are returned Steam will restore your access to the restricted purchases.
What if I am unable to reverse the chargeback?
What should I do if there are unknown charges on my Steam or bank account?
It's important you contact Steam's support team for advice and assistance. You can do so here.