Who I have the same questioned this topic

I keep getting account updates from someone's bank account. The short code 454545 is sending me text messages for pretty much any account activity for this person. I've tried texting "Stop" or "Help" (as instructed by the messages sent to my phone) and I get a "Send Failed" notification for my phone. I've called the bank to stop the texts, but I'd like to fix the actual problem.

This problem exists for all of the short codes I've tried. 32665 (facebook), twitter, all of them. How do I fix this problem?