A: If you bought a legitimate key, contact customer support. They will reset it. If you used a cracked key, you have no legal recourse.

Spotify explicitly forbids the "reproduction, redistribution, or transfer of the content" or "circumventing any technology used to protect the content."

Even if you pay for Premium, those downloaded tracks are encrypted and can only be played inside the Spotify app. If you cancel your subscription, those files become useless bricks.