Account been banned for no reason? False ban.

I just got banned because of a third party software but ive had my acc for 2 years and spent a lot of money on it, and I dont have any interrfearing softwares. I just played valo 3 hours ago, hop off to play fortnite, and then hop back on and it says I got banned? I dont think I played with any cheaters. Nor do I cheat im literally bronze 3 for almost 2 years.