I think the same thing happened to me last night.
I got a notification on my email that my account was blocked.
So I contacted the customer service and I was told that my account was blocked for security reasons, I think they said someone might have got access to my account.

So I requested for the account to be unblocked, and I was able to get access to it.
Casinos or exchanges can automatically block your account if they detect something suspiciously changed with your IP addresses, from a nation to other nations, or quick changes across many nations.
If you are the real owner, still have access to your account, and your account is actually not hacked, you can easily prove the account ownership and get your account back.
If you are sure that your account was not hacked, you don't have to change anything but if it is a concern about that, you will have to reset your account password, and your email password, then email 2FA.
You can see the the currency is on Nigerian currency.
It can be an automatic detection on your location, nationality, and default currency was changed automatically to your national fiat currency.