Billing for Migration Plan Misunderstood by Own Call Center Staff

<p>I am currently on the Smart L Plan for my contract. I was contacted last week by Vodacom with an offer to migrate up to Smart XL which I accepted. I was told that the plan will only come into effect 0n 1 July. I Noticed this morning when logging into my account online that the amount for the new plan has been added to my current bill. I called the call center to make what I tought was simple enquiry: Does this mean the subscription for the plan is paid in advance? Its its in arreas like all the others charges then I wanted to either get the benefits of that plan immediately or reverse the charge and only add it in July when the plan comes into effect. I would rather not go into the detail of the shocking lack of knowledge and understanding of this very simple query that i put to 3 different people and after being on the phone for an hour. I just need some answers from someone who knows what they are talking about. </p>