Disappointed Makro, With Bubble Gum

I bought a bubble gum, within two months of purchase.. My sons bubble gum is not charging, I took into Makro and I am getting a bill and now explanation says it is the powerbutton not functioning..

When I purchased the bubble gum, I asked if it will be fixed if we encouter problems.. I was told if it within the warranty it will be.. But now this..

Makro please provide me with an explanation or rather where it is stipulated that I will incur costs for fixing eventhough the bubble gum is still with warranty..