Hi

So, yesterday a friend of mine used his credit card to pay for premium service ($9.00MX for three months), so i asked him if i could use his CC to subscribe to premium on my account, i used it but when i was in the last step, a pop up from spotify said something like "You've already used this promo", so i thought that the promo was availible only once per credit card, but my attempt to subscribe was also charged on his CC.
what can i do?
will he get a refund?
will i get premium?
if i do not get a refund, will he be charged again once the three months promo period ends?

please help 😧
sorry for my broken english, thanks in advance