Whatwhyuh

Hello, My username is adamcool360 and I got an issues with purchasing new server slots. I saw that there 75% off purchasing so I quickly went to buy new servers slot. It showed that it cost 400 credit so I click it says that it is not refundable and I accept. Then when I went to check my balance it removed 1600 credit instead of 400. Can I get some help with it because it did not applied the 75% even thought it showed it. Thanks in advance -adamcool360