End subscription now, how? (In order to upgrade via phone operator)

[Floppen]

Case, I've got spotify unlimited, and i've canceled the subscription which ends next week.

I got a new deal with my phone operator which includes spotify premium, I cannot upgrade my spotify account untill my previous subscription ends, I cannot use unlimited with my phone and I don't want to wait a week. I don't care that I've payed for it, I just want it to end now.

How?