Money being stolen

So i spent nearly 25 dollars buying overwatch coins for the battle pass and and the pve allowing me to have 1.1k coins saved (Because of weekly challenges). well logging back on around a week ago i had -900 coins. “apperantly” My bank refunded me. I do not have any refunds in my bank statement. So unless evidence proves otherwise be careful of buying anything through blizzard they just might steal it