ISA Interest Being Treated As Part Of My Annual Allowance

I have a Cash ISA with Barclays, who pay interest on a monthly basis into my Barclays current account. I have been manually paying it back into the ISA account. I have just made a payment equivalent to my 24/25 Annual Allowance into my Cash ISA, on the understanding that ISA interest does not come-off my Annual Allowance. Just spoken to Barclays and it does not agree. It has advised that the interest will be added to the payment I have just made and thus I will be exceeding the Annual Allowance. Is this correct and what should I do now?

Hi ,
 

As you are taking the interest from your bank account and paying it into an ISA, it counts towards your £20,000 allowance.  If you have exceeded this allowance, you will need to discuss with your ISA provider. Thank you .