Burned stove wiring in the wall.

I had a bad experience regarding a claim on a stove which wires burned inside a wall. Assessment was done by 2 young guys and the outcome was "due to bad maintenance and old age" how the hell am i suppose to see inside a wall or know that the specific plug that was used is outdated since it worked fine and with no problem. I was given a letter and was told if i dont like the outcome follow the steps which involves an ombudsman and and and. Out of experience i know this will take a long time and due to medical issues i dont have the energy to fight this. I phoned today to ask if they will not considder to look at it again. Staff was friendly untill i mentioned that the claim was declined, then the attitude changed an i was told to follow the steps. Come on guys. I am sitting with disabled people at home, but must struggle without a stove now for over a year.