pay extended guarantree,for what??

I bought a defy stove from House and home just a bit over 2 years ago. Over the festive it started acting up,we reported it on the 14January,and to date nothing had been done. I deel its unfair that i paid over a thousand rand for that extra guarantee and im really not getting My monies worth. The lady who assisted me had assured me that all My docs have been sent to head office,but still,its dragging out,and a technician hasnt even been out!that part alone takes weeks!