Lexington law firm charging my card after i cancelled service Internet

I had their service for three months all they did was remove two things that were very old i could of done myself...I cancelled there service then they charged my card a 60 fee the two seperate 20 late fees(which i cancelled and wasnt late) so i called and complained they did nothing then i checked my statement and again twice they r trying to take money and service have been cancelled for months! So i called again and after holding for a half hour they say there is nothing they can do.....ripoff!!!!!!