Thanks for coming to the Community.
What happens when you're trying to subscribe, are you getting any error messages? If so, trying again in a different browser/incognito window might help.
If Fido manages your subscription, I would, however, recommend trying to reach back out to the folks there so that they can take another look.
If they direct you to Spotify Support again, don't worry. You can give the team a shout one of these ways, and they'll see what to suggest:
Help others find this answer and click "Accept as Solution".
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Note: I'm not a Spotify employee.