HiFi Corp selling knock off products

I purchased five JVC 42 inch smart TV's in April 2016. Within 3 months, one stopped working. I took it back to HiFi Corp Strubens Valley and they had to send it in for repair which took over a month. After another few months a second TV stopped working. Again I had to take it in and wait for it to be repaired, which it could not be so they replaced it. This happened again to the third and fourth TV's, the latter after 1 year; so they wanted to charge me to send it in for repair. I took it to a private company for repair and they said it was not repairable. Now one of the other TV's stopped working which I must try to get repaired. And the service from the sales staff and the Manager is terrible. I have never bought anything from HiFi corp since and never will and have advised my family and friends not to. It seems that they are selling second grade products.