Marko online Skyworth TV

I recently purchased a 75 inch Skyworth smart TV at makro online during the birthday special and when I plugged in the TV IT SHOWS some lines and I logged a query with them and however I was not assisted. They concluded that it was Customer negligence whereas the TV was not even taken for assessment. And there is no proof that the TV was working when it was delivered to me. And now they said I can not return the TV of which is really unfair for me as a customer. Now what am I supposed to do with a TV that is not working.