Why is a # on my Blacklist getting through?

[Lord Vader]

I have both my personal blacklist and the community blacklist enabled. They seem to be doing their job with one exception--a specific number of a telemarketer with a 312 area code keeps getting through! They call several times per day, always from the same #: 312-572-6990. I've entered this number in to my blacklist database in several formats just to make sure it's saved here. However, this number still is able to call me!

[lbmofo]

Able to call you means your phone rings? Do these calls show up on your call logs?

[Lord Vader]

Yes, my phone rings (my blacklist is set to give a number disconnected message) and it shows up on my call logs.

[lbmofo]

Need to call into customer service and have them fix.