We have been receiving automated " robo-calls '' from an anonymous source for months. This past week we received a personal message from Van Ru Credit Corporation. We called them back and they immediately asked for confidential personally identifying information over the phone ( last XXXX digits of my wife 's social security number ). When we refused to give that to them, they refused to give us any information about what they are calling us about. We have never dealt with this company and we have no known outstanding debts owed to anyone. They would neither confirm nor deny that they have attempted to notify us through mail, nor would they agree to send us correspondence by registered mail. They would not provide us with the address they have on file despite the fact that they obviously have our home phone number. They would not tell us what the matter was about. They would not tell us how long the matter has been outstanding. At this point we have no information other than the phone number they left on our message machine and a completely unproductive personal phone conversation. The phone number we received and called is : ( XXXX ) XXXX extension XXXX.