I used to have 2 accounts, one postpaid and one broadband tied to email A.

However now broadband account has been changed to tie to email B while postpaid line has been canceled.

Today I've received an email stating:

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This email was sent to email A, a now defunct account. I do not know who this new gmail belongs to but it is tied to a facebook account named "Jack Son"

[attachmentid=8030326]

I've called Digi CS and they said my accounts tied up to my IC were fine, but offered no explanation regarding email A.

I'm worried that the fraudster will use my personal information tied to the old  Digi account (email A) to attack my banking or other accounts.

Has anyone experienced this before?'

Some insight would help 

What plan are you on?  Which country did you roam in?

Go to a Digi Store and ask for a waiver.  I presume you never switched on mobile data when you were there?  What is your phone model?

Seems like a problem with the current top tier phones, they tend to "leak" data even when you did not turn the data on.  I read somewhere in LYN Telco Talk the only solution is to turn off 4G on the phone.  Good luck getting the waivers from Digi and Celcom.