A business that calls from a phone without proper caller ID or sends email from a gmail account without identifying the business that is behind the email is just exhibiting slimy business practices and is not deserving or your partonage.
This number is Cassidy from the dating service "Great Expectations." If you ever started an on-line profile on thier service, the last step usually includes a message that a representative will call you - and they do. Over, and over and over and over. They want to set up an appointment for you to come in to thier offices and probably pay them some sort of fee. They will not stop calling until you tell the explicitly to stop.