First of all - I hope none of you dial this number - but if you did, how did you fix it?
I called customer service and they seemed completely confused by this claiming that only *72, *73 are valid codes, but *78 basically turns on what I presume to be the do not disturb function that can NOT be turned off from any of the settings on your phone. If you were able to fix this, or were able to get CS to help you fix it, please let me know because as of right now, I am waiting for a ticket to get solved.
Thanks.