Avon ruining my credit record

I used to be an Avon rep in 2011, and then I stopped, I then found out that they had sent me a box at my old residence, which was long after it was sent since I had moved by then. By this time I was being sent sms's that I am gonna be reported as a bad payer. I had to go collect the box and then take it to the lady who signed me up, Wilhelmina Benn and assumed that it will be removed from my records. Unfortunately I still owe Avon R628 to this day, For what? I am struggling to get a decent job as a new graduate. I have called them only to wait for hours on end only to be passed from one person to another on their switchboard and be hung up upon. I have emailed them and I don't know what to do.