Harment on a website?

Just recently a person whom I know online and have met offline keeps claiming on a certain website that I am someone else in a different account and has gotten me suspended 2 times. He's being a snitch and getting others involved.He's obviously an internet troll as it seems to be. I can't report to the admins on that website because of the suspension and the admins on there probably don't care about their users. This user has my phone number and every time something happens to me he sends a text to my phone like a "Ha ha! You got suspended again!" ETC. I don't have a way to block him on my tracfone.At this point I'm not sure what to do. What would you suggest?