No Reply. No Reply. Software Update

So I have a Hisense 49" UHD TV. I bought it like a year ago. I love it, it's awesome. However, about 2months ago, my Netflix was not logging on and it was giving an error code. After trying all suggestions as per Netflix's website, I came to the conclusion, it must be something to do with the TV itself. I contacted Hisense on their website and explained my problem. I was then told to contact ********** as my software needed to be upgraded. On the 25th May, I sent the email with all details. And this is the only reason I gave 2stars, the same I got a reply from Keyde Mohlala, with a link to a file that I needed to download and a step-by-step guide as to how to do the system upgrade. I tried, about a million times but it never worked at all. I emailed Keyde again explaining to him this. On the 29th May, I got a reply and he told me he'd speak to one of his technicians. On the 30th May, I got an email from Rosco February saying he would like to give me a call to try and assist. I rep**** asking him, when would be best for him, and what his working hours are, as I do work shifts and I was hoping to work around his schedule. No reply, on the 4th June, I emailed again, asking if my previous email was received. No reply. Up until now, no one has made an effort to contact me again, and I literally have to FACTORY RESET my TV, every time I want to watch Netflix or Youtube or anything internet based. I'll be honest when I say, it's annoying. Also, the TV is dim and brighting. Super annoying as well. Please can someone just assist with this. Thanks