Las Vegas Athletic Club LVAC Placed item on my credit report that I tried to cancel within 5 days! Las Vegas, Nevada

I got this subscription that they begged me to get cause they are a failing chain. And then when I told them I didnt want it after only having it for 5 days and NEVER using any of their facilities they got really nasty and said "we dont care you signed a contract"  What im going to do is say f*k this sh*t and find each and everyone who works for there company and the collection company and make examples out of them! F*k all this ripoff report sh*t! These people are local and easy to find! In the middle of a poor economy there using contracts to steal money from people! But they will get theres real soon and if they aren't responsible for putting it on my credit report Im still going to make and example out of them till I get to the top!