One was from 9/23 on the card I was switching off of. The card I changed it too was charged on 9/22. My next payment date is listed as 10/22 on my account page. I can also get screencaps from my card apps to shiw the transactions. The only one that says pending is the card I switched too, but that shouldn't matter because the card I switched off of doesn't show a pending or memo and shouldn't have ever had a transaction to begin with after switching.
If you see a pending charge from Spotify on your bank account, you can assume it will expire and get back to your account. Your bank can tell you how long.
Since the subscription process takes a few minutes, pending charges shouldn't stay pending for more than a few minutes. But if the subscription process isn't fully completed, the charge will stay pending for a few days and then expire.
So in this case we can't say for sure if you successfully changed your payment method. Log into your account on our website and check which card you have used to pay for your subscription. Alternatively you can cancel your subscription, wait till your account reverts back to Free and then resubscribe with the card you'd like to use. No worries, you won't lose any saved songs or playlists when your Premium expires.
Hope that helps! Let us know if you have further questions.