Who called from 3107467700

I got this same text last night and I've been on the Do Not Call List and have been for 2-3 yrs now and this SUCKS....

Received a spam SMS from them today at 3:30pm. About home energy audits in Austin.

received a text message from 310.746.7700: "Dear homeowner, Is your mortgage payment too high?  Our relief program can lower your high payments immediately.  Would you like to learn more about this?"

When i called them to be removed from their list, i got a message that their inbox was full.

received a text message from 310.746.7700: "Dear homeowner, Is your mortgage payment too high?  Our relief program can lower your high payments immediately.  Would you like to learn more about this?"

how do we stop them..if we are on the do not call list >?