I upgraded my Vodafone account no 19/11 and then was given 6 months Spotify Premium which started working the next day. However, on 28/11 it reverted to a Free account. I have contacted Vodafone who have tried to help but have got nowhere. Any help would be appreciated.
I've just gone through this whilst getting a phone upgrade. I previously had a spotify subscription on my last contract however it ran out just before my upgrade date so my account converted to 'Free'.
Today i got my new phone and started the setup, i found that i hit the same problem as everyone else - that my account didnt' change from Free to Premium.
I spoke to live support and at first assumed it was a setup problem or somehow related to using WiFi not mobile data.
Turns out it was my fault!!!!!
When you select the Spotify subscription it goes through a setup and then gives you a confirmed screen - in very small text on that screen it says the Spotify account name it's associated with.
Turns out i had a Facebook account, i also had an account associated with my full email address HOWEVER the one that was connected to the vodafone subscription was a username (shortened version of my email address) so i continued the setup and then attempted to sign into Spotify with this shortened email and hey-presto there's a Spotify Premium account with my name on it!
This is really odd as all the accounts had access to my previous playlists and favourited music - i think this is a Spotify issue not a Vodafone issue. I've now contacted Spotify to cancel these other accounts they have in my name.
Long and short: check the small text in the Vodafone subscription setup to see which account is being connected to your premimum subscription.