#hashtagimage issue

I have had the same issue which I found in my cellular data but somehow it managed to download nearly 350GB in one less then one month... as soon as I plugged phone into laptop to do my backup this happened. That was a week ago and my phone has been doing some pretty weird stuff even when I’m not on there it’s creepy! I’ve uploaded pics and I also did a search on my phone and found the following... under accessibility options and I’ve updated everything I can as it matched the keystrokes... they stole god know what information I’ve been really worried about this :( so basically type # in the home screen pull down menu search bar and see what comes up you can click on the first one takes you to accessibility settings... took a while to change back to allow no access but took over an hour and plus a week of stressful conversations because the speech speed was slowed right down and it was like talking an alien lol so now when I do a search of my whole phone it comes up only in instagram and still unsure what I need to do there but I’m taking a break gonna have a KitKat while I await a response :)