Sold a defective stove without a recourse

I bought a DEfy stove from fair price last year October, so far I have had to log 3 incidences, 1st the plates came loose then the technician came to tighten them, secondly, the oven inner glass door just shattered out of the blue while I was preparing dinner. I had just had the oven on for about 10-15 minutes at 150 degrees. They came to replace it without providing me with the reason why that happened. Thirdly, after the glass incident, the oven is not working . It turns red when trying to use it but the heat is just not enough to grill the meat. I logged a call for this but was told that the oven is working just fine since it turns red. My frustration is, I cannot bake or grill the meat still. I tried it again at maximum heat and for 30 minutes but the chicken still came out raw. This is frustrating. I have got videos to prove this