At the end of 30-day trial, you apparently charge for premium without any kind of forewarning.

This won’t do.

I never would have paid the premium for an app I have only tried once, had I known, and I haven’t given you my consent to charge me for the premium. If you’ve announced this charge falling down at the end of the trial, you clearly haven’t done so prominently enough, as I never would have signed up even for the trial with such shitty conditions.

I want my money back.

Also, I’m curious as to where and how you got my credit card details to charge me, as I don’t recall giving them to Spotify to begin with (though my memory may fail me here due to this fuckery-up of yours making me so angry).

After you’ve redeemed the charge (9,99 €, date 12/09/13, further data available from my bank record if needed) I want you to remove my credit card details from your records and with it my entire Spotify account. I want nothing to do with you from hereon.

Unless you refuse, in which case you’ve made what could’ve been just a dissatisfied potential customer into an enemy.