My customer said my site does not take credit card

I tried it myself, it does not work either.  

I put all credit card information and hit submit. It say last action can not completed. 

We did received many  payment before, but I do not know from paypal or credit card.

I checke your form: http://www.jotformpro.com/form/33406202693954

And there is no payment integration there, in order to take credit card payments use any of our integrated payment gateways: https://www.jotform.com/help/47-Order-Form-Basics