There are a number of major antivirus makers who have free versions on the Google Play store.
I'd certainly at least try working my way through these, one at a time, and removing each before installing the next if what you've tried so far has not managed to remove the offending virus.
Remember that malware scanners and virus scanners are not scanning for the same things, at least not for the most part.
Edited by britechguy, 26 May 2018 - 10:15 PM.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
. . . the presumption of innocence, while essential in the legal realm, does not mean the elimination of common sense outside it. The willing suspension of disbelief has its limits, or should.
~ Ruth Marcus, November 10, 2017, in Washington Post article, Bannon is right: It’s no coincidence The Post broke the Moore story