Hisense South Africa poor Customer Service

I purchased a Hisense 55inch tv from my local game store on sunday the 09th December 2018 ,On that same day i had started to install it and then later found out that it had bad flashlighting(White Cloudy Patches) ,On monday i had called Hisense South africa ,they had asked me to fill in a Service Repair Form,Today is thursday the 13th December 2018 3days later still no feed back ? Secondly when i try to call the call centre its says they currently unavailable,I have deep regrets purchasing A Hisense product ,If only i knew the service would be so terrible.My last resort will be to return the tv for a full refund.