DO NOT RENEW YOUR CONTRACT WITH VODACOM

I am so upset with this pathetic service. I phoned last month to cancel my 2 contract and make both sim cards prepaid. Received a phone call from Vodacom retain dept and was offered a reasonable deal on both contracts & I renewed. Today my airtime is gone, I cannot even make an emergency call! WORST SERVICE! Cards are prepaid, but you dedeuct for both numbers!!?????