We have Comcast and if a certain caller won't stop calling, I do the *60. I was given a booklet by Comcast when they did my installation of my landline, TV, and internet and the instructions are in that booklet. There is no fee with my package and I never hear from that number again. You do have to be aware that they can use another number to call you when they realize they are blocked, but I haven't had that problem. Good luck.
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