I tried purchasing 1700 platinum in arcane legends but a pop up said- there was a problem in your previous purchase, and found out I have zero balance in my visa so now I'm Afraid I can't download updates because of the problem, now how can I cancel that request for 1700 platinum so I can download updates in arcane legends? By the way I am using ipad mini the request was through iTunes. . .

Pls. Help me how to solve this issue :-(