8005560011

This number is also constantly calling me.  I have seen this # on other 'callers' websites' and got this suggestion.  If you are a DTE customer, sign into your 'billing' acct online.  Go to 'Subscriptions' and on this page you can unsubscribe to "Offers, etc by DTE".  I've also called this 800 back and spoke to a body who said he'd put me on their Do Not Call list at DTE.  We'll see.  
Also, I found out if you are a customer of a company i.e. DTE, the National Do Not Call Registry doesn't apply.  Good luck.

Calls from this number all hours of the day and night.  No one is here when answered and no message left.  Very annoying, please stop!

I just did the same thing. Spoke to an exceptionally nice man with a easy-listing-radio voice. He promised to remove my name from all their lists...we'll see!

I HAVE BEEN GETTING THESE AS WELL. JUST DOING SOME RESEARCE NOW WHEN THEY RANG AGAIN. ITS AN AMERICAN COMPANY DOING MARKET RESEARCE ON BEHALF OF UK COMPANIES. THEY HAVE SPOEKEN TO ME BEFOR SON NOW WHEN I ANSWER THEY HANG UP. I LET MY WIFE ANSWER SO THEY SPOKE TO HER AND SHE PASSED THEM ONTO ME.
TELL THEM TO TAKE YOUR DETAILS OFF THERE DATABASE AND THAT IF THEY DONT YOU WILL TAKE LEGAL ACTION AGAINST THEM THROUGH OFTEL. IF THEY CALL AGAIN THEN CONTACT OFTEL OR BT TO HAVE THEM WARNED.
BRITISH COMPANIES TAKE NOTE. BRING YOUR CALL CENTRES BACK TO THE UK OR WE ONT TALK TO YOU.

We get several phone calls each day from this number; however, we do not answer calls unless we know the caller or the caller/company is identified on the caller ID.  There is no identification made except for the toll-free phone number.  I checked the Internet for DTE's Home Protection Plan and sure enough, it is their phone number.  How and where can I report this incessant calling?  I read the post where someone called them back but they were not given access to anyone at DTE.

Add the number to your contact list, with a "z" in front of the name to drop them to the bottom.  Then go to options and check the "go directly to voicemail" option.  Since they won't leave a message - it essentially makes them go away!