As an update to my post, I did receive a call back from Comcast. The person I spoke with did find out that this place is a Comcast affiliate of some sort, but NOT Comcast themselves. As such they should not represent themselves as Comcast, and if asked they should admit to this.
My biggest gripe with this is that I am on the Government Do Not Call List, and unless I have done business with a company, they are not allowed to call me with marketing garbage like this place did. Well, one more gripe - the frequency of the calls. The Comcast agent I spoke with did tell me that the call made to me was traced to a particular person there, and from what I gather, that person will be handing out resumes come next Monday morning.
They have also been warned to respect the Do Not Call List a little more faithfully in the future, and if a person asks not to be called again, honor that.
I encourage others to call Comcast if they are being hassled and report this phone number.

Just got a call from them at 7:41pm

It's too late for Comcast to be calling, imo.
and I don't even have comcast.

I started getting calls from them about two weeks ago, and they have called almost daily. I asked them to remove me from their call list and the agent started reading off a list, spoke 100 miles an hour, and sounded like she had a mouth full of donuts or something. I disconnected the call. Yesterday I went into a Comcast office to pay my bill and reported this at the same time. Today I received a call from Comcast Customer Security and was told that they would investigate this, and ensured me that Comcast had nothing to do with this. Comcast will contact me with a resolution to this.

It's Comcast.

Called me 3 times. Never leaves a message. When, and if, I can, I will answer it and see who it is and post here for all to see. And be aware.

Keeps calling to sell Comcast xfinity even after I said no.

Getting calls every day a 3PM. Iam mad with this guy, I dont know who's this person.

Thanks for the comments confirming this is an unwanted call; three times so far this week ignored with no voicemail...I just blocked this number.

Getting called daily from this #.

Keeps calling every couple days, I never answer, they never leave a message.
Says its from East San Fran Bay area.

They called me @ 9pm. Really!!! I go to work at 4am. Even if I didn't, anything after 8, is too late.

They called me too omg how freaky

I answered a call from this number. It was Comcast/Xfinity telemarketing.

They no call me no advertise me none some solicitors.

I just got a call from this number and they didn't leave a message.

I live near there and this number has just started calling 3 to 4 times a day. Of course, I don't answer. Makes me want to file a complaint, even though I know it won't do any good..

This is 'America Support' calling about an offer from Comcast.

Called two consecutive days at the same time with no voicemail.

This number calls once every couple weeks. Doesn't leave a message

This number [(925)350-5998] calls several times this week, sometimes more than once a day. Left no msg.
The caller ID says "ANTIOCH, CA"