Who called from 2129201706

I've received several calls from this number over the past couple of days. No one on the other end, and once a empty voicemail was left.

It is Aqua Finance calling about billing. I too was receiving calls, and every time I would answer, they would hang up. After reading a thread on another site I went online and called their main number to speak to a representative - 1-800-234-3663. I was told that their company cell phone is used for billing and set on an auto-dialer. It calls 20 numbers at the same time, but once the first person answers, it hangs up on all the rest. I know other companies that have this same set-up. Annoying, but fairly standard practice as far as I understand.

IDK if this is the same company but got 2 calls from 2124058371 & when i talked to an operator  i said i wanted of their list the guy hung up on me.

Multiple phone calls some times in the same day, no one on other end stopped answering phone calls still persist.

i also received calls from this number on 12/15/09, 12/16/09, and 12/17/09, multiple times. no answer and nothing on their voicemail other than the phone is through sprint. must be a ghost...