Vodacom refuses to transfer airtime already paid

I took out a top up Vodacom cell phone contract and pay each month for R200 airtime which I cant use because it is on another cell number.<br> I requested Vodacom when taking out the contract, to transfer the airtime to my existing Vodacom number. <br> I also visited the Brooklyn Mall Vodacom store and asked them to arrange the transfer, but they said they will not do it.<br> I now have R1000 airtime (5 months X R200) on a sim card of a number which I cant use.<br> I will lose R4800 worth of airtime over the duration of the 24 month contract!!! <br>