Since there is no area code but says San Diego, it's a clue that Portfolio Recovery is getting desperate. They are the worst debt collector on the planet. They specialize in buying expired debt at 2% of the original value. If they had a valid claim, they would sue you. Instead they just call you with their thousand secret phone numbers many time a day. My advise: drop your landline and get a new # with no referral #. It's illegal for them to call you on your cellphone.