Refund because of honest mistake

Hi There, I bought Modern Warfare at May 10, 2020, with PayPal. I did not see the price was in USD and my currency is CAD (canadian dollars), it was an honest mistake, I activated the game in my blizzard account, I was wondering if i could get a refund, the game is on sale rn and I could buy it for 44$ in my currency, Thank You!