What to do with suspicious activity on the phone and wifi?

Question

Computer networks

Hello!

I was sitting at a PC, watching a series, and then an SMS message comes to my phone from something called Ruskern_WIFI , then the phone number [phone] calls and a girl speaks into it and calls the code. After these events, when I log into SBER online, they tell me "This network is not secure. Please connect to another network. error number 60-0"

I changed the password to wifi but still the same!