Chapter nine: Xoom Quest

so i was chugging my normal 15 xoom juice smoothies like i do every day. today i asked for extra protein, so i would have enough energy to fight sparticus. then the dude stopped serving me cuz i was only using the lucky seven cards, (if you buy 6 the 7th is free) so i had filled out 15 and was trying to get fifteen free ones. whats up with him not serving me?