Had problems with Santander about 2 years ago, asked me endless questions about me living here, been here 23 years, answered their questions, they e-mailed me to say everything was OK. But I withdrew all my money except for a fiver, I didn't trust them, quite rightly, as they stopped my account 2 days before Christmas 2022, I contacted them and they admitted they were in the wrong and gave me 75 pounds compensation. I carried on with them until last September, when they started asking questions about tax, i took all my money out except for 1p. They messaged me about a month ago asking me to ring them as they had more questions, so I closed my account. They said they will send me a cheque for the outstanding balance, so I am looking forward to receiving a cheque for 1p.
I have also had friends who have had problems with Barclays Bank in the UK.