jacked up phone cards

why i bought this five dollar sprint phone card so that i could call my father ( who is in jamaica) and i punch in the pin and his phone number and the automated message come on to tell me i only have "four minutes for this call" what the fuck.. isnt that equivalent to like $1.25 for one damn minute... i am soo upset i will be calling sprint today to discuss this problem with them. i either want a free 50 dollar card if thats the case or a full refund...they bugging.