Samsung damaged my phone and refuse to fix it

It's over a month now that my phone is at Samsung. This is my 4th report. Samsung SA are terrible at replying and solving issues. They call me at 6pm and say that they fail to contact me. My phone went for a new screen, when i received it i noticed that the technicians damaged my lock button. I returned and they promised to fix it. They now insist i pay for the repair. Their technicians are terrible. All in asking is for them to fix what they damaged. They refuse. Samsung sa also seems to be doing nothing for over a month now. Hire professional techicians and fix my phone. I wont pay a cent for your terribly service. Samsung sa should be removed from they responding list on hello Peter, because clearly they don't reply or solve anything