Hello there @Erica Sjöström
If you feel your account information has been compromised, you should take appropriate steps. Usually the first thing you do when digital security is compromised is to change your password(s).
Plenty of information and resources are available to assist you with internet security: password managers, credit and data monitoring, etc. Avail yourself of them and take prudent precautions.
If you need direct assistance with your deezer account, contact deezer support here → https://support.deezer.com/hc/en-gb/requests/new
Cheers,
G