Charged multiple times when trying to verify my student discount

[fastomid]

I wanted to apply for the student discount but after entering my student details in it brought me back to the purchase screen so i reentered my card number a couple thinking that i entered in wrong but when i checked my logined in to my bank I charged an extra 4 times i was wondering if u can help me fix this.

[fastomid]

just to clarify it is not on this account it is on my other account which is now premium but the charges but I still have been charged 4 extra times.