Issue in cancelling a simple data contract which Vodacom extend without notice

So to cancel a contract is night and is also extended without any one knowledge. A data contract that has been running for 2 years is now an extra 3 months and then they want to know why do I want to chance it. In addition, you may only chance it between the 1st and 7th of the month in which the contract expires. It's mentioned that everyone needs back up data and for them it's not right that I have wifi at home and work as well as data every month on my phone. Where has life changed so much that they can be so arrogantly to tell me what I need and what not!! Can't show their system if I have more than one contract on name, because every month they call to smear something off to me............ I get more than just fed-up and extremely angry for the "call centers" who can't take no for an answer and try to smear off well to humans, because when it comes to cancelation then they give you gas first........ is that which is life today. Gun wonders that one no longer wants to answer a phone, because if you are desperate to sell something, you should at least have some pride and respect on that side of the phone and take people into consideration. Can't believe it's that difficult and such a big problem for Vodacom to allow their system to run a data contract on time. Vodacom stop messing around with customers, no matter how big of a company you are. I really feel like changing every contract I got with you to someone else because it is just number for you and no service. Always a new story with each and every contract I need to upgrade, downgrade or cancel. It is not on and then if I phone I have to hold for ever and the operator need to pass my phone call around - definitely not a number one company in my eyes.