(404) 267-0006

Is it okay for them to call 7 times in one day on each phone and not leave a message?

Received called from WAMU using the following numbers: 404-267-0006, 305-384-2104, 480-296-0235, 503-405-9247,425-507-0644, 509-481-9106, 954-377-0257, 602-358-0120,****-449-0075, 760-904-5066. When I answer the phone there, no one says anything and phone goes dead.  I have contacted WaMu (I only missed 1 payment by a month). They are not willing to work with me unless they automatically deduct the min. amount out of my checking account.