Avangate 2checkout I got suckered into believing I was beening hacked and bought into thier service 3 years ago. Harassing phone calls. Internet

I do not want Avangate's services. They started harrassing me with phone calls on April 28th. 2018 and I repeatedly requested that I was NOT interested in anything they had to offer because thier service was a ripoff. Today May 1st. 2018 Avangate started calling me at 3:30 p.m. and continued to call robo style 25 times within 1 hour and 45 minutes. I told them that I was on the do not call list but they continued and became relentless, rude and overbearing. I'm sick of these pukes. Who do I contact to file a lawsuit.