Vodacom does not have customer service!

My 2 year contract with Vodacom ended end April 2018. I went on prepaid. Vodacom started to charge me for a new handset. After numerous calls I sent an affidavit to their *****Dispute Dept on 22/6/2018 stating that I did not order nor received the so called upgraded handset. They have not responded at all. My service is now disconnected because of non-payment of my account. Paying will be tantamount to admitting guilt I am angry because I do not owe Vodacom anything. I am 74 years of age and need my cell phone.