Most unprofessional company EVER!

I cancelled my Neotel contract last year October. Neotel has now decided to list me as a slow payer because I have not paid for my account in 6months. How is that possible even though I paid the cancellation fee and was then charged R1500 for a router that was collected by Neotel!!! Now to make things worse I am listed as a slow payer and I can't take out credit!!!! You are a bunch of *****! I cannot believe this! I am typing this complaint while I am on hold with your call centre! And now you just hung up! 30minutes!