Paying without spotify

[Pluttazz]

Hi! 

I subscribed for Spotify premium 7month ago, with a 3month for 9SEK deal. But spotify only worked for 1month, even though it said I have premium. So I unsubscribed after about 5-6weeks. But I am still charged every month and for the last 4month that is over 400SEK. I don't know what to do. I've checked every email account I have but there is only one which is connected to Spotify. 

How do I get my money back?

And I thought customer service were suppose to make it EASIER for the customer not the other way around....

Thank you for any help