Payment after free trial...

[Nutcaze]

Hi, pretty angry with this now.. Just had my free trial and it apparently ended without any notice, and apparently there has been a payment from my paypal to spotify. I NEVER said I wanted to pay for this, and got no notifications... 
I really want my money back, and I have already cancelled my subscription. It's not a lot of money, but I'm still a student and everything counts.. 
I've sent a mail to the Spotify help about this.. 
I remember I read that after your trial you can choose to pay afterwards or not.. 

Anyone else had this problem? And got their money back? It happened today..