Online upgrade - service suspended

I recently upgraded my cell on Vodacom online, new iphone delivered within time specified, Great or so i thought. I received a call from vodacom collections 2 days ago saying i owe them the R150 admin fee for the upgrade. I informed the lady that i checked the box which says \add it to my account"as i pay via debit order. She said she would arrange a debit order to be put through next wednesday"