Vodacom accounts

I have complained at hello Peter a few times. Vodacom has responded all few times they will contact me. Nobody has made an effort to contact me. I am fed-up complaining about my account, with no feedback. I want to cancel all 4 my contracts with immediately affect. I have been struggling for months with no feedback. I refuse to get penalized as my contracts have not expired as yet. But I can't continue with bad service, no feedback. And them messing with my account any longer. Can I please be guided as to who I can take this cancelations to.