Sinotec and Lewis home store are useless

I am absolutely completely disturbed by the technical team at Sinotec! I purchased a brand new flat screen smart 55'' tv (11 months ago) from Lewis Furniture Store. Within 6months the tv popped up with an error saying the software was outdated. Without the update the tv is pretty worthless as viewing Netflix, DSTV etc. cannot be accessed. Basically the tv won't work. I am irate because I have approached customer services at both Lewis and Sinotec and both parties have been unhelpful. Both have not battered an eyelid in assisting to resolve the issue, which means I've been without a tv for the last 5months. Sinotec and Lewis have responded by saying that the "brand new" tv was purchased AS IS and nothing can be done despite the warranty still being valid. They refuse to accept the return of the tv. Sinotec did send an email with updating software but even so the files were ******* and cannot be used. I'm at my word end and no idea how to take this forward. How is it possible that the service department at both Lewis and Sinotec refuse to assist under warranty??

I will never recommend Sinotec and Lewis to anyone no matter the specials or deals. The after sales service is pathetic and non existent.

Cookie Murugan