Can Vodacom remover my accumulated telephone time after I cancelled the contract?

<p>I was informed today, Thursday 1 Sept. by the Vodacom call centre that I must use up the accumulated airtime by month end because it will fall away on 30 Sept. because I am switching from a contract to prepaid.</p> <p>I have paid for that credit and can use it at my pleasure and leisure and VODACOM- has no right to remove it at the end of the contract- I PAID FOR IT AND WILL USE IT AT MY LEISURE</p> <p>If Vodacom removes my credit- IT IS THEFT of my accumulated airtime.</p>