Vodacom *****ing from me

I informed vodacom that I would like to cancel my contract as their prices were being adjusted in an unexplainable way. My contracts original price was R750 but I ended up paying R849 . No one could explain to me. In may they debited the outstanding amount but to my surprise in June the 25th and July the 26th they debited whilst the contract is cancelled. Vodacom is the worst ********** contract you can ever take in south Africa. If you want to be happy in your life stay with other celphone contract companies not Vodacom. I***