Customer account went into liquidation help?

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We have a customer who's company went into liquidation. They then started up a new company under a new company name however a new account has not been set up for them. Just a name change to the old company that went into liquidation.

I have only recently found this out when I sent over a statement which contains combined invoices for both companies.

I need to send the dated Invoices to the liquidators and send the new company and up to date statement separating the two companies. What would be the easiest way to go about this? the oldest Invoices dates back to August 2021 and the new company started January 2022

Many Thanks In advance