Mechanical policy cover

I have a mechanical and electrical policy with Warranty solutions... My vehicle started jerking so i took it to Kia Boksburg to have a look why its jerking... They informed me that the xar overheated due to the radiator cap not sealing anymore and a pipe... I said no problem i have a mechanical plan so it will be fixed . They sent the claim thru to warranty solutions and Craig notified them that due to the plan not covering the radiator cap they wont be paying the damages.... So a engin doesnt just break by itself something causes it... Which make them very clever... They dont cover the cause of the breakage so it wont be repaired..... Please make sure to read the fine lines on the contracts... I cancelled the policy now with immediate affect which i was paying now for along time... Money down the drain... And surely i wont leave it here