No Aftersale Service from Makro Marketplace

I purchased a La Germania stove online, through MarketPlace, Makro, who delivered it on time, however, the after sale service when my stove gave me problems, were pathetic. I phoned almost fortnightly, the Call Centre was great, however, they said that it was escalated to supervisors who was going to book the repair, and NOTHING!!! this is now more than 3 weeks! I still have a broken oven