Notification that deceased was getting a social welfare payment - Clearance

Hi.
I'm doing my Mum's executery and need clearance to distribute the funds. citizensinformation.ie says:

"If the deceased was getting social welfare​

If the deceased was getting a social welfare payment, you must inform the Department of Social Protection of the death before distributing the estate. This is to allow the Department to reclaim any overpayment of pension that may have been made.

The Department has 3 months to decide whether or not an overpayment was made."

Does anyone know exactly how to get clearance by officially informing the Dept as I've been looking, and phoned and spoke to several people, and no-one can give me an exact address/email etc to notify and what to include in the notification.

Thanks very much for considering

The number/email will depend on whether your mother was receiving a Contributary or Non-contributary pension

Presumably, as executor, you will know whether payments were made to her account or not

Thank you jpd.
Social Protection were notified at the time of passing and a telephone follow up by me says there is a weeks liability outstanding which I will pay imminently. I was just wondering if this is "official" enough. I would like to pay the overpayment (1 week contributory widows pension) and then get "official" clearance - that's the juxtaposition - where do I officially seek clearance?
Thanks again for considering (will be posting soon about same problem with fair deal (not a loan - just assistance with weekly payments which was stopped a few years ago when she received an inheritance that put her over the limit))