"Thank you for inquiring about your bill, let me explain what happened. Let me first explain how you are billed. You are billed current which means we bill you for the current bill cycle you are in. When you received your bill, it's already calculated for that current bill cycle.
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When you make a change to your rate plan and features in that same billing cycle, any charges that occurred won’t reflect until the next bill. Right now, you are seeing charges for this bill from changes you made last month that we could not bill you for. Moving forward, if you don’t make any changes this month, your bill reflects $$---. Hope this makes sense " (CX IS BILLED IN ADVANCE)