Called a few times the other day and left a message but could only hear background noise. I called back from a different number and an automatic machine greeted me with "Thank you for calling GMC credit services." once connected to a live person, I told them that if I owe any debt, they need to sent me a written notice by mail. They asked for my address and I told them that if they had my phone number then they have my address and not to contact me until they send the notice. Haven't heard from them since.