Police are concerned about recent reports of phone scams in parts of regional Victoria.
A police spokesman said the callers were claiming to be from either the Australian Tax Office or the Australian Federal Police, and requesting personal information or credit card details.
"If you receive a call of this nature, hang up immediately," the spokesman said.
"Do not respond to any requests for information.
"We ask that people be aware this is happening and share this information with friends and family members, to help avoid falling victim to these scammers.
"If you are in any doubt, or think you may have been scammed, call your local police station for advice. You can also report scams to Scamwatch at scamwatch.gov.au."
Every year, thousands of Australians are targeted by scams - online, via phone, mail or even in person.
Since August this year, many Australians have been getting scam text messages about missed calls or voicemails.
This month many scam text messages talk about a delivery with the latest version, saying it's your last chance to collect a package.
They often refer to DHL and always ask you to take some form of action in relation to the delivery.
Scamwatch is urging recipients to not be fooled, and do not click on the link.
Clicking the link downloads malware which gives scammers access to your phone.
Android phones and iPhones can both receive such texts.
Unlike earlier scam messages (which are also still circulating), the new text messages usually don't contain spelling mistakes, so they can be harder to spot.
They do contain a website link followed by six to eight random letters and numbers.
There is also a vaccine passport scam.
As COVID-19 restrictions start to ease for vaccinated people in some parts of Australia, Scamwatch is urging people to beware of scams relating to vaccine passports.
These can look convincing but are a scam designed to steal your personal info.
If you receive a text message or email stating that a vaccine passports is now available by clicking on a link, delete the message straight away.