10 months of trying to get help with a faulty oven

I bought a Defy stove through Macro and had it delivered Oct 2018. I don't use the oven much, but then a month or so later I discovered that the oven doesn't close properly, so I can't bake anything in it. Took me months to finally get someone to come and look. A technician fiddled and left. The improvement was about 10%. I've now been trying a couple more months to get this fixed, but still no help. In total it's been 10 months of trying to get this sorted. Macro refuses to replace the oven or refund me, Defy just doesn't get back to me and in the meantime I can't use the stove that I bought brand new. I would not recommend anyone buying through Macro or buying a Defy product. The service has been non existent.