Cancelling Adobe express free trial

Hi, 

I got a free trial for Adobe express for 30 days, I want to cancel it within those 30 days but I already got billed for it and now my profile says I am a premium member. I would like to cancel my subscription and want a refund of the deducted amount from my bank account. 

Can someone of Adobe support help me with this? It's not conveinent at all. 
Thanks!