Yes! They finally got back to me last week, after weeks and weeks of waiting.
In summary, they said that it was a double recording from the system. A little bit complicated, but I'll try to explain here:
1. On XX Jan I tried to withdraw cash from a CIMB ATM at a Petronas station, but was unsuccessful. My BP app reflected the transaction immediately as a "CIMB ATM" transaction, and marked it with strike out text (like normal unsuccessful transactions).
2. 3 days later, I got another separate entry on my BP app at 3am saying there was an unsuccessful ATM withdrawal from "Seven Bank" at 3am.
CS explained that the second entry was due to some system process whereby the unsuccessful transaction was reported twice, as this was to show that it had been "reversed" (even though the first entry was already marked as unsuccessful). She said that although the two entries appeared unrelated on the app (i.e. CIMB Bank vs Seven Bank, and different dates), she confirmed that after internal tracing, it was confirmed that they were from the same transaction. The system just reported twice.
I gave my feedback that this double reporting an be quite misleading, and although it wasn't a "fraud", it is very worrying to get two separate transactions, and that weeks and weeks of waiting for them to trace the transaction and respond to my report was also not very satisfactory.
Hmm.. hope this is really just a system bug.. but the explanation doesn’t sound convince.. if this really happened to any of the bank, I don think any of us can accept it..