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U can choose to top up to the main balance only, and use *119# to ownself buy the plan with the balance on your desired day.Heya system still don't accept advance payment?
Was told by the retailer to pay only on the due date!
Otherwise, will have a shorter usage period for example if we make payment like 3 days earlier (eg due on 30th), the new due date will be brought forward by 3 days ( due on 27th).
Any comments if this is correct! Tia.