Non feedback of TV purchased

On the 17 September 2017,I purchased a 58 inch Sinotec, upon my switching it on at home, less than 5 minutes the TV playing, it produces a certain sound only to find out that, it cracked and bring a line across it,when I took it back to makro for them to return it to manufacturers, they told me it is my responsibility to phone them and take it there, I tried to explain that I never had a full day in possession of it,but did not want to help me., I left the TV there until today the 27 October 2017, no one contacted me,and I don't have TV at home, this is very bad service