10 Oct - Email BT to Aeon from MBB
10 Oct - received acknowledgment back by reply email
13 Oct - Called for verification

Now pending for payment, but payment due date is on coming 23 Oct, would it be sufficient time to clear the payment from Aeon? 

Saw other posted, some take 10 working days??

Bro, need clarification from you.
There are two overpaid scenarios here, which one you were referring to ?

1) Your AEON statement bal is say 2k and you apply BT from MBB 5k, therefore you're AEON is overpaid by 3k. Then you ask AEON to refund to your MBB SA or before MBB pay AEON, you requested MBB refund the overpaid 3k to your SA?

2) Say your MBB CL is 10k and you have already BT 9K max. In order to BT again, you overpaid or rather prepaid your MBB account 9k then you BT another 9k again. But what is the benefit of this type of prepayment to BT again ?    I count left, count right..... no benefit also.  Please enlighten me. Thanks.

But it was from AEON Statement balance BT to MBB, no points from both sides, right ?

1) you owe bank A cc rm1k
2) you bt to bank B cc rm10k (overpayment)
3) call bank A to get the overpayment of rm9k to be transferred to your casa