Hacked

There’s a app that is called Hazesec that has been taking $10.06 twice a month for the past year out of my bank account. When I downloaded this anti-virus app I thought it was a one time payment. When I found out that they were continually taking over $20 a month I have been trying to stop them but nothing is working. I have even changed my bank account number but I couldn’t use my iPhone to do certain things with out having my payment info in. As soon as I put my new info in that same app took $20.12 out of my bank account. And I can’t even find this app in the Apple store anymore at all now. I’m begging you. Please help.