New contract- no data!!!

We are a charity and renewed our business contract with Vodacom. We got new phones, but when the new contract went into effect, the data on one of the phones did not work. We phoned the call centre and did what they said to reset everything, but it still didn't work. We phoned again and were told it was because international roaming needed to be disabled and we must write a letter to disable it. We went into the Telepages Vodacom in Port Shepstone, but the lady would not accept the letter and had NO interest in helping us solve the problem. We phoned the Vodacom shop where we bought the phone and they tried to remove a R200 limit that was a system error. It still doesn't work. The month is now almost over and the 1 GB that was supposed to be used for education purposes at our community center has basically been lost. Vodacom has failed to give us the data we paid for this month, no one wants to help solve the problem, and the children we support have suffered as a consequence!!!!