Verizons $15 doller plan? help.?

okay , so if i had the verizon's 15 dollar plan in January when i first got my backberry and i broke it in February so i had to turn to my old enV touch for a month with out a data plan, and then i got my blackberry fixed and tryed to get the 15 doller data plan again and they wouldn't let me and made me pay 30 dollers for the data plan is that fair ? cause' i just ended up canceling it and went back to my enV touch. what can i do to get it back?