Shocking after sales service for Bigger ticket items is a waste of money at Onedayonly

I purchased a Reebok treadmill off the OnedayOnly site, thinking that the discounted price was a win for me. Anyway I only started using the treadmill about 6 months after I purchased it as I was busy with renovations at my home. At about 1 month before the warranty expired the treadmill would just shut off and the keys on the keypad would work randomly. Anyways after logging a request for help in October 2022. A technician was sent out and it was established that the main board was the problem and needed to be swopped out. The new board was replaced on the 17th November 2022. One the 13th December the same problem started where the treadmill would just stop working and then I was given functions to reset the machine. Since December I have only used the machine a handful of times and the maximum time the treadmill will work is 20 min. Also after every second use it seems I have to clear the machine and then not all apps are available on the machine. My issue is that I am now left with a machine which is in very good condition but does not work. even though the main board was replaced in a month the machine stopped working again. Onedayonly is my only go to and they sorry the machine is now out of warranty so not their problem. In effect I have a R17k door stopper. So don't buy expensive machines on Onedayonly, the aftersales service is ****... and especially not Reebok Brand either...seems this inferior machine only sells at a reduced price via an online retailer that can't help much.