Hey @Isobelle1, I am sorry to hear about this, please contact our Costumer Care team asap via this link:

https://support.deezer.com/hc/en-gb/requests/new

Also please change your password! 

I have since cancelled my subscription because of this and I'm still getting 'login in' emails

Hey @Isobelle1, cancelling the subcription does not delete the account, 

please change your password and follow the steps on this link: 

How do I delete my account, if cancelling my subscription dosent work, I keep getting emails telling me someone from America is trying to log in to my account numerous times a day