******* practices

I had a data deal with Vodacom for 20 gig day and 20 gig night, when the contract period was over, I taught I would let it go to month to month. On my debit order I saw that I was being charged almost a thousand rand more than usual. When I queried this I was told that I got the contract on special and since the contract period is over it reverted to the original price. I was never told this. How can a contract increase by R1000. Now I am trying to cancel my contract, when I told the Operator that she went silent and cut the call, when I tried again they answered but nobody spoke. I kept saying hello, hello to no avail. I hope my bad experiences serves as a warning to other potential customers.