I find this number on my caller ID constantly - at least 2-3 times per week.  I have tried to call the number back, but it just clicks off. We are on the National Do Not Call list, but, as others here have said, it doesn't seem to do much good.  I have read on several sites that this number belongs to Premier Carpet Care and I have read reviews of Premier that specifically point to the idea that they target their telemarketing to seniors - and that the actual service they provide is a rip-off. In my humble opinion, any company that does business in this manner should be investigated by the D.A.'s Fraud Unit.

Just got a call from 650-898-0321. Didn't catch name of the company. While on the call I have pressed 1 to scheule an appointment, after 10-15 rings I got someone on the other end of the line. When I asked to speak with someone responsible for these phone calls they just hanged up. I guess I should've tried to get some more information from that guy, but I was sleepy as this call woke us up. I have tried to call back on this number but it just clicks off. Our phone number was on the Do-Not-Call list for a long time, this is one of the very rare telemarketer calls that we got. Filed a complaint with Do-Not-Call Complaint Registry https://www.donotcall.gov/Complain/ComplainCheck.aspx

Thanks for all of your posts and research.

Repeatedly receiving automated phone calls from "Best Carpet Care". I am on the do not call list. I have asked them not to call.
I scheduled a time for them to come out so I could tell them not to call. The original call said they would come 12-2 and call first. They showed up about 4:30. I asked for a business card. It showed Daniel Carpet Cleaning.
1-888-229-9830.
I then called this number. A women answered "Best Carpet". I asked to be put on their do not call list. The women who answered said she would put us on the exclusion list

Pretty much the same scenario as "Jim" describes.  Numerous calls.  If you wait for the prompt and immediately ask for their name, they hang up.  Then, I made an appointment.  The guy showed up on the wrong day and put his boss on the phone.  They spoke in what sounded like Hebrew to me, so I assume they are Israelis.

Got a call from a foreign country for Best Carpet Cleaning and they refused to give me a US phone number. They hung up.  Got another call from and international phone number for carpet care.  So I made an appointment.  A van pulls up to my driveway with no signage. A guy steps out with a contract DANIEL CARPET CLEANING at 1888.229.9830.  I ask for the company phone number and he points to the contract. The contract has no business address. The phone number is no good.  His boss called to notify me he was going to be late, with an anonymous number.  The carpet cleaning equipment was shaky at best.  The Marin County DA office is investigating.  If you have any info on any of the companies listed here contact me.  I believe they are one and the same.  Oh, yea, in case Daniel Carpet Cleaning is reading this, I got his license plate number and so does the DA office.