I am receiving repeated calls from an entity on my caller ID displayed as Portfolio Recovery. No message is left. Each call comes from a different number, so call blocking is not effective. I have received no written communication from them. I have no outstanding debts or collection items whatsoever. Portfolio Recovery has many unfavorable complaints and comments on numerous Internet sites regarding their collection tactics, including complaints of attempting to collect debts from people who do not owe money. I am at a loss as to how to stop their calls.