I need an instagram expert to help me recover my hacked account

My business instagram account got hacked about a week ago & ive been following every step that instagram offers to recover & take back control of my account..but ive been unsuccessful. Im having trouble with the security code & authentication code. I downloaded Google authenticator & inputting the code it gives me when prompted, but it keeps saying error invalid code. I really need some professional help with this issue. Im sure it will be a simple fix for you experts..but im unfortunately pretty very techy challenged.