Should I be worried about my device being remotely accessed(hacked)?

Long story short.. I believe my Galaxy S5 runing CM12.1 is being hacked by an individual I have upset.

Symptoms include:
-Gmail account password changed(not by me)
-SMS from email addresses, spam.
-SMS from random numbers with random characters (vs6ve&$+ugevbs)
-Root icon in status bar wont turn off anymore
-Recent task list showed my system files being accessed by my file manager app when I did NOT access.
-Tons of FC's from all kinds of apps

I have wiped all possible partitions in TWRP 2.8.5.0 and reinstalled newer CM12.1 nightly.. No change.

Changed my cell number, wiped, only enable root when needed, and contantly disable mobile data out of paranoia..

STILL got 1 text from random number with random characters on first day after changing my number and wiping..

Googled and found this info:

http://www.techhive.com/article/1641...martphone.html

http://hackolo.com/how-to-hack-an-an...hone-remotely/

Any help?