Some criminals specifically target international students, telephoning them and
pretending to be from a legitimate organisation (such as the UK Home Office, an education agent or even UKCISA). They demand money (calling it a "fine" for a non-existent immigration problem), and claim that if you do not pay them quickly, there will be damaging consequences (for
example, deportation or cancelling your visa).
Recently UKCISA has had reports of Chinese students being targeted by fraudsters using WeChat and mobile contacts. Students are contacted on their mobile phone by people claiming to represent their bank, the embassy, police or other reputable agency and are told they own funds immediately, often being offered preferential exchange rates on currency conversions.
If you think you've been targeted please speak to your International Office at your university or contact Action Fraud to report it.