I brought my Asus laptop in for a dc jack repair a...

I brought my Asus laptop in for a dc jack repair after a week the jack burnt out. I then brought it in for warranty to be repaired it turned out it was not install properly. they then called back a few days later saying they some how had broken my motherboard (it was working correctly when I brought in) A few weeks pass and the repairs are complete I went to pick it up and they told me the month long warranty had expired while doing repairs they waved the repairs on the dc jack but then wanted me to pay for the motherboard they had to replace when they broke my perfectly good one.