Impossible to help you with the instructions provided.
Who tell you, you, a software (which one)
How did you find out?, hacked google account, other account?,
How do you think you have been hacked, installing a non play store apk, surfing malicious sites, opening a message.
What are the symptoms.
I could go on for several pages and certainly for nothing, 99% of cases with normal use are false positives from antivirus software.