Yes, you can use your student discount after the three month promo trail for $0.99. What I did was use my 7 day free trail then I used my $0.99 promo to optimize my benefits from their promotional offers. I believe that as long as your a student you can use he student discounted promotional rate as opposed to the regular premium rate.
I paid $0.99 for 3 months premium, but my premium is discontinued after 7 days. Is it a scam? The after sales service of spotify is very bad, as you will find no where to contact them, but only read their standard answer from forum or search in google.
U can get the 3months at .99 if u take a copy of the email they send u and forward it to FTC and submit a complaint for false and or misleading advertisement. Once u do that u will instantly get a reference number. Take that number and send to Spotify informing them you reported them for false/misleading practices. They will reply with apology and issue you the 3 months at .99. I did this it works. Should not have to do this though. This company is maintained by liars and pure scum. Could be free for an eternity and still better options out there that aren't so scandalous.