Complaint against vodacom

I would like to lay a complaint against Vodacom and would like to say I am utterly disgusted with the poor service that vodacom has provided. I have been struggling for 5 months to cancel 1 item off my account and because they did not want to cancel it, I did Decided to pay for they items that I want to keep on my account, however they refuse to accept my payment and now I am sitting for 2 cell phones that has been switched off and to put it back on, not only do I have to pay double my instalment but for the item that I am STILL am trying to cancel. A product that I do not want anymore.