Caller: scam posing as Ubank

He called me 3 times in one day. I ignored them. no voicemail left, no SMS sent. red flag 1.
I called the number late that night to see if they have an IVR phone system but the number rang endlessly with no messaging. red flag 2.
he called me again the next day. I answered.
he knew and voluntarily gave me my full name, the bank I am with, and the last 4 digits of my debit card. (and he obviously knows my mobile number)
he claimed to be from Ubank's investigations team. he didn't ask me to verify anything else and started discussing my account. red flag 3.
he claimed my debit card had some suspicious payment attempts for crypto currency and he wanted to check if they were legitimate or fraudulent.
I knew he was suspicious at this point and told him I'd just call my bank directly and talk to them.
he tried to keep me going with the call and offered to send me an SMS that would confirm he is from the bank.
I knew this was also suspicious and pointless so I hung up.

I called my bank and they confirmed there were NO suspicious charges blocked by them, and that they did NOT call me about it.
So the guy who called me was a scammer.

Moderate English (UK) accent.

Caller: Michael Stephens

Stay clear, caller is a fraud. Impersonates bank fraud team, British accent, which is unfamiliar yet distinctive if you are from UK.

Called from Private number multiples times, starts by urgently advising that account details have been breached putting pressure and convincing you he is from fraud team; and knows your card details, email and address. Will only initially say 4 digits, but actually has the full details including home address (which they can't pronounce if it is an Australian location).

My card was already cancelled, so I played along. Scammer will ask for more details - asking 'generated' questions probing for further details to steal your identity. Unclear why he wants PIN, best practice is never re-use PIN. Will ask for your physical card. When I refused to answer his questions, he escalated me to "Nigel Anderson". This guy hung up on me as I was apparently 'wasting his time'.

This outfit is a scam mob based in UK/Ireland - the likely leakage is via an insecure online shop or stolen data that has been sold on the dark web.

Caller: Michael Stevens

Same person called 0230am tried to get details of my account UK accent calling from Australia apparently. Asked for my user name. He had details of an address I knew but no related to my account.HSBC have confirmed this is a scam number

Caller: Michael Stevens

Same thing has just happened to me. Called from private number multiple times initially. Claiming he was from the Ubank fraud team, and knew most of my details, asking for my last four digits of debit card. He asked for my pin, and was able to send a verification code through the message which came through under my security code ubank messages chat. UK accent Male.