They are just taking money to help you. Some are fraud for example someone called and told to a man that switch off his phone for2 hrs that man did the same, after sometime, he was suspicious so he switch onned the phone, he saw a several missed call from his family. So he called them back and they told that someone told that they have kidnapped that man and the voice was real like that man. Now the man understood what had happened and complained to the nearest police station and came to know that there are fraud companies. If they tell it free it means they are fraud. They take money for your safety