Keep in mind that you do not have the pay the amount in dispute. If you have proff that your bill should have been an amount different from your actual bill, then you have a case for a partial chargeback. Figure what the diference is and file a dispute just for that amount, that is if you recieved the meds you ordered.

From what you have written, you should be entitled to the difference credited back to your card. I have gotten every chargeback I have ever filed because I was in the right and had proof to back it up.

Good Luck,

MrB