This is mainly for those considering of returning as an existing subscriber, but have not yet re-subscribed or canceled after 15/04/18.
This Re-Engagement Offer is limited to those users who subscribed to the Premium or Unlimited service before the date shown in the offer. If you subscribed to the Premium or Unlimited service on or after this date, you are ineligible for this Re-Engagement Offer. Current Spotify Premium Subscribers are also ineligible for this Re-Engagement Offer. The Spotify service may not be available on certain personal devices. Neither prepaid cards nor Spotify gift cards can be used as a valid payment method for this offer.
A limited number of Re-Engagement Offer Offers are available, while supplies last. This Re-Engagement Offer expires and must be redeemed before the date advertised. Spotify reserves the right to earlier terminate this Re-Engagement Offer at any time and for any reason. After such time of termination, Spotify shall not be obligated to redeem any further Re-Engagement Offers.
It's cheaper to just get a prezzy card, open a new account and get the $0.99 3-month trial.