Changing to prepaid without authorisation

<p>I have been a contract customer with Vodacom for over 10 years and have never missed a debit order, when trying to purchase data and activate international sms I now get told I do not have access to this service. When I tried calling vodacom I was told that I was moved to prepaid?? Why?</p> <p>I am half way through my 24 month contract and still pay my monthly contract subscription so why was I moved to prepaid? <br />I can now purchase data ect for all my family members but not myself!<br />I flew overseas last week and was left unable to contact my family as vodacom disabled my service without any reason.</p> <p>Thanks</p>