I had Verizon to block all my text msg services all together too because I was getting so many of these. It's not fair that we have to pay 10 cents a hit for this crap (that is for those that do not have a text package). And the government Do-Not-Call registry is a bunch of crap too.
I never saw the purpose of a text in the first place. I can call the other party and say what I want to say just as fast.