I had a similar experience to that described above. I had a nonrenewable one year contract. After the year ended, I noticed I was still getting billed. I called Knuckle Up but the voicemail box was always full. Then, I disputed the charges and was reimbursed.
Months later (last month), I was contacted by their collection agency (Palomar). Every day, twice daily, Palomar or ABC Financial, or whatever other name they do business as, called me on my cell phone but never left voicemails. Every time I tried to return the call, I was put on hold for 30 minutes. Finally, I reached them and explained my contract. I was told that the contract automatically renewed. (Can someone please explain what nonrenewable means, then?). I spoke for hours, sat on the phone on hold for hours, trying to reach the right party to resolve my account, each company alleging someone else was responsible for the account. I still don't know if it's resolved. I faxed them my contract, and I hope that will be the end of it.