I just called the Home Depot Customer Services department to inform them about this issue. This number has been calling my cell phone anywhere from 5-10 times a day for the last two weeks. It is ANNOYING as heck! When I spoke to the woman from Home Depot, she didn't know anything about it, but did say that Home Depot Cusmtomer Service is indeed located in Tennessee with a "423" area code. She suggested that sometimes people give incorrect phone numbers by mistake on their accounts so if people are receiving this call in error (which I have been - I've never even BEEN in a Home Depot before), then it could be that. She also suggested answering the phone next time they call, and explaining that it's the wrong number. She said that would be the quickest way to have them stop calling.
I hope this helps. These calls are such a nuisance!
These folks call my house 2-3 times a day, and when you call them back, they are rude and not helpful at all. I hope these calls stop soon. They don't seem to care that they bug you day and night.