Dealing with multiple stocks ISA's inadvertently opened in same tax year

[BTD]

What is the best course of action not to fall foul of HMRC. The inflows to the accounts don't make up the allocated 20K allowance. But a few trades have occurred on one of the older accounts (buy instead of sell) and a couple of the newer share accounts were used instead of the normal money account.

What is best to do? I have called the HMRC advice but am not getting any smart advice as to what to do or whether to close the newer accounts. It's (or at least should be) clear that the opening of the accounts isn't to defraud as the inflows across all accounts are less then 20K in total.

Any ideas of what to do?