Number is owned by Telstart Corp at 601 or 597 Davidson Rd, Pittsburgh, PA 15239. The following data came from viewing several Google results. The president is listed as Shawn Hooper. Business data online shows 20 employees with annual revenues of 1.3 million dollars. Their web address is http://telstart.net. Their web shows that they have a 75 seat call center (explaining the daily calls at the same time every day). It also shows that Telstart is a newspaper circulation specialist and lists numerous newspapers. My local paper is listed, so I'm going to contact them to request that my number be removed (since other postings show no response from Telstart...a company hired by my local paper). Good luck.
1) Make sure you're on the Do Not Call Registry.
2) If this company has a business relationship with you, they are still permitted to call, though, until you tell them not to. You may want to answer and tell them not to call anymore. Otherwise, they may call for months (happened to me).
Re: not leaving messages. I had this issue with another company and the caller told me they are "not allowed" to leave messages. I asked her to elaborate whether it was a company policy, rule, law, etc., but she could not tell me.
They are a marketing firm and one of their accounts is with the Post-Gazette. They have called me to let me know that the Post-Gazette offers an electronic edition that I can log on to. (I picked "event reminder" as the type of call, since that is closest to the call purpose - they were calling to remind me to log on to the Post-Gazette site.)
You can call back their number to see why they are calling you. It took them a *long* time to answer when I called (maybe 20 rings), but the person who answered was polite and to the point.