Telkom's ************ness!

I took another phone contract in march this year, at Telkom mobile Southgate mall, an A5 samsung galaxy phone, it worked fine until recently, the down volume button suddenly stopped to work , so two weeks ago I took it to Maponya mall, they booked it for repairs. so yesterday they sent me a sms stating that my device was 'deemed' out of warranty and it was quoted R1,958.34, I mean that hefty amount for a button? and at what point do my devices \deemed"out of warranty"