trac phone Long-life cards don't work if you have double minutes. No warning about this. Internet, Internet

Got a 1-year/double minutes/800 minutes included card.  It does NOT say anywhere on this $100 + card that you are wasting your money if you already have double minutes  (I didn't realize I HAD double minutes, don't need them, actually).
When you try to activate it you are not told that this is WHY it did not activate. 
If you call the (Mumbai or thereabouts, from the voices) you get to wait fifteen or thirty minutes ot get an answer at all--and this DOES come off your existing minutes, bless their little hides (yes, I'm sort of a Southern Lady).