Poor customer service

I have cancelled 2 contracts on the 10 of August 2018. Vodacom have continued to charge me for these contracts in September and October. I raised this with Vodacom in September and its is now the end of November and I still don’t have a resolution. The call center staff constantly tell me that I will get a call back with information and I do t get any callbacks. It takes me at least 30 mins at a time to get a hold of the person that is assisting me. So sick and tired of this poor service that I have told them this morning that I will stop paying my account if they don’t sort out my problem today. So sick of Vodacom can’t believe that I have been with them for 13 years.