Continue selling devices with known issues

Good day, I bought a jvc smart tv 2 months back at your store and returned it because it was faulty on saturday the 14th of December 2019 and was promised by the manager (Graham) that i will get a call on Tuesday the 17th of December 2019. And till now i have not received anything and i sit here with no TV or any feedback and it pains me because i paid for this device to use it not to gave it sit in your store. I am writing this to have solid feedback from your head office as i nolonger want the device because your sales people did advise that the TV has a known issue of apps not working after some time. I would like a full refund with immediate effect. Thursday the 19th of December i will be taking this a step further with the ombudsman as this is unacceptable.