First RED FLAG - the number they call from is a faked, non working - disconnected number.
Second RED FLAG - the business name they gave didn't come up in a search of businesses in that field.
Third and largest RED FLAG - they wanted money UP FRONT for this service. That is AGAINST the law - federally.
No one is allowed to charge money UP FRONT before the consumer gets the service in this industry. Every time someone pays up front for this type of deal - they end up losing not only their money - but in most all cases, they lose the house as well because these scammers rob them of any additional funds that COULD have gone towards paying on their home.
Run from this scam.
Best way to tell if the caller is a scammer? Hang up and then dial their number - if it comes back disconnected then you know it wasn't a legitimate call.