Non-cancellation of my contract and more charges

I would like to share my bad experience with Vodacom.In March I phoned to cancel one of my contract phones with them as I am struggling to pay for 3 contracts.I told the lady since my ********** 723 number contract ends in April I want to cancel it and use the Wifi router instead.The lady advised me not to cancel but take a cheaper contract of R39 and receive R55 airtime monthly.I refused but she said I use a lot of airtime this will be better for me.She never advised me to also call to cancel my insurance aside.On the 20 April I realized my debit order is way over from R709 to R817.I called to enquire and I was sent from pillar to post.I reversed the R817& deposited R540 I know of later on I paid the balance of R277 something. I phoned again and I was told my matter will be looked at checking the recording as well.No one updated me on that.I received an sms that I owe R100.88 I don't know which no one told me about.I don't understand why I keep phoning and my matter is not taken seriously.I phoned to say I want to cancel this 083 contract again but still my bill is very high.I don't understand why when someone cancels you don't cancel as requested or do as promised.Now I receive a statement saying on 20 May I will be charged more than R900.As I said in March I cannot afford this but now it's getting worse.Once again I cannot pay more than R600 for phones.Vodacom has disappointed me and I don't want anything to do with this network anymore.They don't care for their customers complaints and act on them.I have been leaving messages to be called on my office number ********** 325 /7 and no one has phoned me yet.I am sooo frustrated now I don't know what to do anymore with Vodacom.