I can only think of four things that might be going wrong-either you weren't signed up with your service provider for call-blocking but assumed you were and followed the procedure to block but it didn't work; you are signed up but didn't follow the procedure correctly; the caller changed their number or you didn't block them but you thought you did.

Contact your service provider and have them sign you up or walk you through it, or look in your owner's manual for instructions.

If you were signing up for Google Voice, getting it set up can be confusing. In this case, the setup instructions are available on Google. If you need further assistance, get someone to help you.

Have been calling me repeatedly, daily. I'm glad I found this website!They called today and asked me if they could talk to (my name) and I said I was speaking and then they hung up on me...So I blocked the number

Telemarketing on behalf of TD Visa and some "credit alert" service.  They wanted to send me a free copy of my Equifax credit report.

calling

...this last call was Dec 8th 2011 just after 1:00 PM

and again, 8:00pm on July 13, it's like spam but they don't leave a message, so I will ignore further calls.