Removal of my contact number - Consumer Complaint for Woolworths (Pty) Ltd Head Office

I am really disturbed that no one is able to remove my contact number that is being used for a client that is in arrears with her account. I constantly get calls and sms sent to me about making payments. I have contacted the number 031 3022500 to ask that they remove my number but now I seem to get more disturbance. Today I tried calling head office 021 4079111 but someone picks up and then drops the call without communicating. I would appreciate if someone can call me to sort this out.