i think it might depend on how long ago the account was. i was in the same position with tmobile, but, i paid the entire amount, and paid it to tmobile, and disputed the ca via the cra. it was deleted from eq, but haven't received a response back from ex and tu. this method did not work however, when i did the same thing with directv however. i also sent multiple letters via email, planet feedback, and sent a letter to their customer service address, with no response. i sent a pfd to the ca, with no response either. but, hopefully, you will have better luck