These errors can be caused by different factors. We'd recommend making sure that your payment method has been issued in the same country as your Spotify account, that it has sufficient funds and that all details are correct.
If everything is correct and you still have issues, you could try using an incognito window or waiting a few hours and then trying again.
Lastly, if none of the above work, you can always reach out to our Support team here. They'll be happy to help further by checking your account to see what might be causing this issue.
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"Music touches us emotionally, where words alone can't." -Henry Thoreau