Anyone can, and should, file a complaint about them to their local data authorities. Actually it’s a good time to get some experience with filing a complaint to ones local data authorities because it is a very helpful and legitimate way of getting your rights.

I have filed a few complains but threatened to file even more, in order to have my data deleted according to GDPR. Even when companies tell you, that you have to download an app to delete your account, they “fins a way” to do it, if you mention the authorities as an alternative