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 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.