CHARGES ON MY CREDIT CARD

I was offered to change free avast to premium avast coverage which was charged to my discover credit card...Only a few days later my computer would not work or reboot...3/29/2017.. My computer has been in the repair shop and it will be costing an  estimated over $300.00 charge..I have contacted discover about this problem and am following the instructions on contacting avast regarding what has happened.I am expecting an answer to reverse charges on my credit card..Immediately...I will never want to use avast again....I hope no one else has this bad experience...