Who called from 6783699968

Calls and leaves no message. If they call again I just assign them to an iPhone contact called SPAM with either a very unique ring tone or none at all.

Nationwide Crédit Inc. Collection Agency
Does not leave messages and keeps calling even when they have the wrong number.

So how do you know they are aware they have the wrong number/

Thick Asian accent, not understandable. Calls multiple times every few days.

Nationwide credit inc, no messages, called back and got recorded line message