The guy I spoke with when I called back this number (07) 5437 2992 said it's Mercy Ships Australia

Someone called me using this number (07) 5437 2992 and mentioned Mercy Ships Australia

I returned a call from (07) 5437 2992 but reached vm for Mercy Ships Australia

Got a call from a lady in Mercy Ships Australia when I return this number's (07) 5437 2992 call

Got a call from a lady in Mercy Ships Australia when I return this number's (07) 5437 2992 call

Caller: May be Mercy Ships Australia seeking donations

As indicated by others, the call appears to be from Mercy Ships - unless the number has been spoofed. I didn't answer the call.

https://mercyships.org.au/contact/

Probably asking for donations. I am a regular donor already and support the organization's good work wholeheartedly.

Suggest, if unsure and wanting to donate, do this via the above website and not over the phone. If the call is genuine, it will accept the suggestion to donate via the website.
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This is on the ‘Reverseau’: https://www.reverseau.com/(07) 5437 2992.html:

(07) 5437 2992 is a Fixed Line Telephone Number registered under the name of Mercy Ships Australia which is located in Caloundra, QLD 4551 and could be provided by Telstra Corporation Limited.

However, number (07) 5437 2992 might be spoofed by scammers who will manipulate the number so that the call appears to be coming from a local or well-known phone number, making it more likely to be trusted or answered.
Until now, phone number (07) 5437 2992 has not received any review yet. Be the first to review on this number (07) 5437 2992. Please share your experiences on (07) 5437 2992. Your first-hand experiences really help other users.

So far, Caller ID (07) 5437 2992 has no history of being a scam call.

Mercy Ships Australia company rang me from this number (07) 5437 2992

Got a call from Mercy Ships Australia with this number (07) 5437 2992

I called back the number (07) 5437 2992 and the person I spoke with said the company is Mercy Ships Australia