I trusted African Bank with my money and they let people take it

THERE WAS ***** ON MY ACCOUNT AND THEY CANT DO ANYTHING. I trusted your bank with my money but you let someone take it without caring. I only had the account for a year. An amount of 1399 went off my account. I didn’t buy anything online but was told it’s an online purchase. You normally get a pop up request to approve the purchase but I didn’t get that. When I called they told me they will reverse it. Then sent me a message saying they can’t reverse it I need to call Microsoft.