Vodacom contracts do not end!

One expects that after signing a two year contract with Vodacom for cell phone, that the contract ends after that period but to my surprise, they kept billing me after that! The phone had been ****** of which I informed Vodacom as well. When investigated, they calmly told me that I had to call them to cancel the contract! Why on earth would I take out a two year contract for then? Why don't they just call it a contract without a period? And by the way, forget about a refund!<br> I have had several contracts with Vodacom in the past twenty years or so but when the current one's mature, I will be moving to someone else!