I figure my share certificate was sent to an old address. Just...

I figure my share certificate was sent to an old address. Just updated it today in computershare account, I havn't checked since I opened it decades ago. Cant register with UK site as always says info invalid. Just sent messages to both sites so another week delay before answer.
Sent message to Pensana asking if they can do something to prevent fraud and protect my shares as it a substantial 7 figure value or send new certificate....as advised from googling what to do...

rang Computershare UK twice tonite, first guy hang up after I said my SRN didnt work when registering. 40 minutes and second call lasted 36 minutes and ended without answer.

Used option one; Do nothing
"automatic conversion into shares listed on LSE"

Does anyone know if the SRN on 2 march 2021 holdings statement of Pensana delisting, from computershare Australia,
is the same as the SRN on the PRE share certificate. It says Pensana so i would assume its correct, but have tried numerous times to register
with computershare Uk and always says invalid info.