rejection of claim due to last 3 months left

I booked in my laptop for faulty aux port and no sound. when I put my earphone jack into the aux port it blew. (Are these laptops not SABS approved to protect the public against this??)<br> I sent it in to your service department for fixing as it is still under warranty. they got back to me saying they cannot fix under warranty because someone put the power in the aux port and it blew. first off, this is not possible as the power does not fit in the aux port. secondly the positive of the power is on the inside of the adaptor so once again not possible as it wouldn't make contact with anything if by some miracle I made it fit in. they are making excuses because my laptop only has 3 months left on warranty. I do not accept this and will take legal action if not resolved to my satisfaction