Scammers are sending fake messages claiming you have made a purchase of $300 to $2,000 and urging you to call a number to stop or reverse the payment, the ACCC's Scamwatch service warned on Tuesday. The messages, which arrive by text, email, app notification or calendar invitation, often impersonate payment services such as PayPal or companies including Apple, Google, Microsoft and Norton, and may include personal details such as your name, email or address to appear legitimate.

If you call the number, scammers may ask for bank or card details, request you send money claiming overpayment, install software to access your accounts, or trick you into buying gift cards. Scamwatch advises checking whether any payment is real by logging into your official account through the real website or app, rather than using contact details in the message, and not calling the number or sharing financial information or one-time codes, scamwatch.gov.au reports.