Struggling to cancel Vodacom contract

Two months ago I contacted Vodacom contact centre with regards to the cancellation of my cellphone contract. I was informed by the advisor that I could call on the 1 July 2018 as my contract would expire on the 31st August 2018. Instead when I called today the 3rd July 2018 that I cannot cancell my contract that I should call again in November..I was also informed that I will get another call later today..now at 18h30 I got a call and this time I was told i should call again in September.. I am so tired of Vodacoms poor service and was hoping this would have been end of it. For the last 6 months I have been given different dates..all I want is to cancel the contract as I do not like their poor customer service