Cannot submit dispute/ incompetency of staff

I buy my credit report every month from Transunion, yet they fail to update the accounts information. I have been trying to dispute an account that was closed over a year now and whenever I call them, their call-centre staff know nothing about their product. I spend 45 minutes to an hour on the phone with one of their employees, who then finally grasps the concept that they have to send me a form/ give me an e-mail address where I can send my paid-up letter. Then they attempt to transfer me to someone who can do that, whereupon I am transferred to the main menu.

Their site also doesn't work for submission of credit report disputes, it bombs out every time I have tried to submit it. Which means my account from last year which was closed, still shows on the credit report and affects my credit!!!!