Bad Customer service

I’ve been a customer with Vodacom forever and a day. The service now is so bead they about to loose a customer. I phoned more then a month ago to cancel my contact. I was offered a good deal and decided to stay with Vodacom. To my regret I am still waiting on my device that Ram can’t deliver due to a administration error on Vodacom’s side. The device was brought to me and taken back as there are an invoice number in the place of my ID number. I’ve contact customer care numerous times and send emails to the team leader Tertius Fidgerald with no response from either. They actually ended up blocking my number at the call center. A simple error that can’t be fixed but your debit order goes off monthly. Please assist