I received a strange SMS from KTB bank. What does it mean?

[ubonr1971]

''

[Ralf001]

Is that your main/only bank acount ?

[ubonr1971]

1 minute ago, Ralf001 said:

Is that your main/only bank acount ?

no. I have numerous bank accounts. why

[Ralf001]

your available balance is dire !

[Upnotover]

All the banks are doing this in one way of another. Drop by and sign a form or two, no big deal.

[HampiK]

The KTB send out to all customers (or maybe all foreign customers) this message.
if nothing has changed since last time, then probably nothing to do. 

it's like from time to time the bank is obligated to check if all information is still correct.
If you have the option of a KTB branch nearby, only go short and ask if they need something from you.

In my case, they already have a Thai TIN, and I'm not an US american (facta), so no more info they wanted from me.