This ridiculous I am having the same exact issue and have tried everything suggested. I have contacted the spotify support team and sheerid because I have been approved for the student discount. I tried using another browser as well. But still unsuccessful. I have asked to talk to be put in contact with a live person and to make my payment over the phone and the support team still sends me a generic email about going to the Community for answers. I even tried to just payy the full price and use a different username and email address but it still wouldn't not allow the payment because my bank was having a bad day? OOPS?
It seems everyone is having the same issue so will you (A spotify employee reference) inform spotify (what I thought was a great company.... not anymore) that their payment page is broken and they are losing money and prized customers, all to a technical issue on YOUR side not OUR BANK!!!!!!!!
So i at first i had a single premium account, but then i switched to premium family. i needed to pay today so i was waiting for the transaction, but they only checked €10, when they actually needed to get €15
same problem. ive tried different card with sufficient fund, but still it was not accepted by spotify. i even called my bank to check if there's a problem with my card & my account, but they told me it has no problem and its active. so SPOTIFY, maybe its your system. please try to escalate this one. ive been disconnected with my premium subscription for the past couple of weeks, and its really messing me up.