SMS: 200 rubles are included in your account. After an hour comes the second one :"I accidentally credited you 200 rubles, please return them to this number! Thanks to you!"
Well, I think someone is running... I send a response SMS:"Oh, look for the bad guys!"
Immediately incoming message "Thank you for using our service".
I checked the account and took 200 rubles. After five minutes again comes the SMS :" Ah, one found ))"