Samsung Galaxy Tab 3

tablet is still under contract and was sent away for repairs for freezing the whole time and flickering received it back telling me its beyond repair the board is burned and there is absolute no reason for the board being burned by me as I sent it away for the second time with the charger given to me showing them that the correct charger was used and all I keep hearing is sorry there is nothing that can be done because I have no insurance, when contract was taken out I wasn't given any insurance option plus tablet is still under the 2 year contract now they say I have to buy a new one.. completely furious that I still pay for a product that I cant use. please help!!!!