I brought a Beko cooker from Comet over a yr ago took out 5 yr cover. Since I brought it, the oven turns itself off in the middle of baking!! Anyway 6 months ago I noticed the paint work at the botton of the cooker is rusting either side, when I asked for a replacement they said I was not entitled to it cos it's only cosmetics & does not interfere with the cooking / baking!!! Told them it was under 1 yr old & that should not happen they then said sometimes it does & they lef it at that. Cover runs out in 2017 what are my rights (