lancastrian Overthehill

I too have accidentally opened 2 cash ISAs in the same tax year - 2023/24. First for £20,000 was July 2023/24, with bank A where I also have an ordinary account, was July 2023. The second with Bank B was January 2024, also for £20,000 but at the same time I transferred an old (10+ years) cash ISA for £53,251.07. I informed Bank B of situation a few days ago. I was told that the 'new' ISA and the transferred amount had been amalgamated and the whole must all be cancelled, It would be simpler to cancel the July 2023 ISA if that was allowed but the situation is further complicated because it is now 3 months past the end of the tax year concerned.