I keep getting these calls too. They did leave a message once claiming to be collections for Home Depot. They were looking for someone I never heard of. I answered the next time, spent stupid long time on hold, talked to some rude SOB who refused to believe I wasn't "John Whatever" (depsite the fact that I'm a woman). They still keep calling - I've had this number for 10 years. Whoever John is - too bad, he's not here. I'm ready to turn them in to the attorney general for harassing collections practices - especially since I didn't even know Home Dept HAD a credit card.
They call constantly and I don't have an account with either Home Depot or Radio Shack, nor have I shopped there. My phone line is messed up too so I can't even answer it until Verizon fixes the mess they made.