I just BT from CIMB -> MBB. There is no new account. It will charge as in whichever MBB CC you choose to BT over. e.g.
BALANCE TRANSFER PLAN G : 01/12 X

This will only show in your online M2u / statement AFTER the Statement Billing Date.

If you need to know whether the BT is approved and money transferred:
(i) Call up M2u CS and ask them.
(ii) Check if the payment is made to your BT source. e.g. In my case, is CIMB, I can see online cimbclicks the BT account is paid 1 week earlier before my statement is due.

Correct. Fax is direct to the department in charge (whether they working or not to collect and process the fax is another story)

Submit to branch, or even HQ, they still need to put in delivery-envelopes, and delivery-boy/courier to the processing department, which will normally not in that floor/building/location. Normally it is at other place. So, if the person-in-charge forgot/mixed up/delay the delivery, your application will not reflect in processing department. Hence, when you call up CS to ask, they say, "Not in system" Coz the documents may still stuck at the branch there underneath tonnes of paper

CIMB snail mail me every month. I use that to BT back to MBB 12 mth 0%

I photocopy and fax in to MBB BT.

However, when I BT from MBB to CIMB, I remember I submit online print-out statement / print-screen only >6 mths ago. Approved what... That is why now already transfer it back to MBB.

They hope you get itchy on the lump sum and spend it all. Then hope you missed payment or extend payment, only then start to charge u 9 9.