I bought a downloadable content and been charge twice? It's starting to be an issue and I really need help to get a refund. My email is TanKhuongDo@live.com , thank you.

I recently checked my bank. I had bought something that was over $30 Dollars on the 2nd of March, and now I checked it again and had been charge with the same amount of money again, exact dollar and cents, on the 4th of March. I know I didn't buy the same thing twice. I just want to fix this this problem and get my refund.