It is only when you use Zong to buy credits, using your credit card you only get about 15 or 1600 credits, depending on £ against the $. Zong occassionally drops down to 1900.
and some people are at their happiest when there having a whine and a moan.
(If you have been using a credit card to buy credits you will need to click on change billing info to see the other payment options that are available. Zong, paypal, google etc,)