You might have already tried this however they are at an age now where they understand emotion and sympathy. Really explain to them how you feel, how hard you work and everything that you do for them. Pretty much beg them for help in the hope that the nice method works. Their hormones will be raging and they will struggle to control them which doesn't excuse their behaviour however maybe coming in nice might play out better! Explain to them that you're a family and you all work together. If not cancel phone contracts or block their phones on family link!