They are fraudulent caller they ask that they will pay your utility bills and you can pay them only 50% or less or more  but what they do  they used the credit card of other people  and latter credit card companies will chase you  that  you misused the credit card of someone and even fraudulent case could be registered against you  . How they get the credit no from different peoples . there is an other way to get no , like they call the people that they providing the services of Cheap long distance services like you can call anywhere 24/7 in $10  or they call that they provide the services of  kids tuition  in $ 10-20 per month . these all services are tricks  to  just  get the Credit card no and PIN .
These fraudulent are common in Asian communities like Pakistan, Indian , and others