Bad service / False promises

Good - day~ I am extremely upset and disappointed with the service I've recieved from Samsung ~ I purchased a 58 Inch Samsung Smart TV on the 27th Sept 2020 from Hirsh's in Fourways, I got it connected and installed a week and a half later. It is barely 4 months old and it's been working 110% perfectly fine until 01st Feb 2021 where randomly out of the blue the picture is gone and TV makes the on & off musical sound all the time. I made a call on both the 2nd and 3rd of Feb to your call centre and spoke to Nomhle who gave me false promises on both days that someone will call me with regard to my problem, but seems it's not the case. I was made to rush home from work as I was told someone would call at 6pm but nobody did. I live alone, have no help, I saved up to purchase a Smart TV for months after not having a TV for quite a while. I logged a query on FB messenger addressing my problem and tried best I could to describe the issue, I was told by Nichole, what steps to follow & what to do but the same issue persists. It is unacceptable that a TV packs up after 4 months...I am NO TV technician, This has left me in tears...and I am hoping someone would be able to assist ASAP in coming to see what the problem could possibly be & decide on whether my New TV needs replacing. I have my original slip and still have the Box for the TV. Thank you !