they are texting me!!

I received 50 text messages to my T-Mobile cell phone from this phone number this morning.  All 50 came in rapid succession, one after another.  I could not stop it.  Each call was from a different number but said it was from b@wamu.com and to contact 1-304-907-0878

This is clearly spam as WaMu no longer exists.  It used to be Washington Mutual Bank but has since become Chase.  

I have been on hold with T-Mobile fior over 30 minutes to see what they can do- something's up!.  

I have registered all of our phones on the National Do Not Call Registry.

I have been getting these same texts since 8am this morning and they won't stop. Tried texting back to tell them to quit and tried calling the number back and it is disconnected.

I HAVE RECEIVED A BUNCH OF TEXTS FROM THIS NUMBER ON MY T-MOBILE PHONE THIS MORNING.  I AM REGISTERED WITH THE NATIONAL DO NOT CALL REGISTRY.  I WILL BE REPORTING THIS NUMBER TO THEM ALSO.

Same here.  I haven't recieved 50 messages, more like 10 with more incoming.