Shocking Customer Service

Have been charged for 5 months for a new device on my contract that I never requested or received. No amount of calling and telling my story repeatedly has made any difference. I was finally given an email address to send the whole saga to and received an automated response to say that the email address had been de-commissioned and do not expect a reply. Have since emailed 2 more addresses I have found and still no reposnse. I have been with Vodacom for 20 years or more and I am disgusted with their lack of service in this matter.