Why are blocked numbers sent to voice mail?

vh1

    and why is T-mobile voice mail so dumb as to notify me I have a voice mail when no message was left? 

     

    I get weekly calls from spammers trying to sell me solar.  They just wont take no for an answer. If I block a number I want them blocked!

     

    Guess I'll have to switch to a carrier that knows how to deal with spam calls better.

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