You need to contact them again and ask why. The most common reason is you requested a chargeback from your card issuer. If you do that it is a last resort action that you should only do if you never want to do business with that company again.
If you didn’t do that then you have used an invalid payment method multiple times, or violated some other policy, such as ordering from an app store for a different country than where you reside, or at least appearing to. This can happen if you use VPN connections that don’t terminate in your country of residence.
This is all speculation; I know nothing about you; these are just the most common reasons accounts are disabled. And disabling an account is a last resort; Apple will only do it when all other ways of trying to resolve an issue with a customer fail.
But if you contact them they will tell you the reason, and also tell you what you must do to avoid this happening in the future.