I'm on a Spotify family plan. I recently bought a Spotify gift card on sale, because you can usually apply those for a credit on subscription services.
Well, it turns out unlike the rest of their plans, Spotify Family doesn't support gift cards. I didn't even consider that it might not apply to all plans, and didn't check the fine print. Disappointed, I contacted support, who were happy to inform me there's a solution! I should cancel my plan (kicking all my dependents out), sign up for a _regular_ plan, apply my gift card to it, and _then_ sign up to the family plan again. This would, of course, mean that I'd have to reinvite my entire family to the plan.
They didn't really seem to understand why I was less than enthusiastic about this "solution".