Worst service

Greetings my problem is not resolved yet by edgars in menlyn my name is Isaac tshabalala I complaint about my phone huaw y3 on the 12 December 2018 that was send for Repaire and came back with dent,in December edgars guys told me they received a call from mtn saying my phone was replaced they are waiting for it to be dispatched now Is January they are still telling me the same dispatch story which may take another week or so,the only solution I have for them now is that may they take it off my account bill cause I don't want it anymore I am tired of complaining this is a new year ,please help me I don't want to start my new year with Haert attack from complaining.