It was CBA calling to let me know my credit card had suspicious activity.

Caller: CBA

(02) 8055 4117 is the CBA cards team. and the mobile number 0426 305 517 the the number they text from to query transactions

I rang once and got disconnected

Caller: Comm Bank

It is a legit number.

Caller: Commonwealth Bank

I was overseas where I work and received a 'suspect' looking sms from a mobile number: 0427 741 911 telling me the message is from 'CommBank' and that they had temporarily blocked my card ending in xxxx. Message: 'Please confirm a recent ATM transaction for $215.00 in local currency has been performed by you Reply Yes or No'. I almost dismissed it as a phishing scam, but after entering the number 0427 741 911 into google and landed on (this) website found that it was legit.
I had indeed performed an ATM withdrawal for the stated amount, so I replied Yes. Immediately after I sent the reply, I received another sms from 'CommBank' informing me: 'The block has been removed from your card and your card will be ready to use in 15 minutes. If the problem persists, contact us on (02) 8055 4117 for assistance'
I called the number and was assured it was the Commonwealth Bank's security team and they said that a security alert was raised from 2 previous attempts to perform the same withdrawal, but had failed owing to a fault with the ATM. I then went to another ATM which was working ok and successfully completed the transaction. That's when they put the temporary block on my ATM card and sent me the sms asking me confirm that recent transaction was performed by me Yes or No.

i got sms from this nmbr that said my account on cba has been lock up and need verification

I called back number (02) 8055 4117 reached IVR for a company called Commonwealth Bank.