Vodacom: Data Roaming

My close friend is battling with unfair 'Data Roaming' billing by Vodacom. Her husband went to the UK in December, like many South Africans he couldn't find employment locally. Vodacom, without being asked, initiated data roaming. Husband and wife have tried, unsuccessfully, to have this service cancelled. They do not need this service and cannot afford it. Last week a customer service agent at the Call Centre confirmed that the service was not requested and that the charges would be reversed, however, my friend received an email today confirming that the charges were correct. Help!