In mid-may of this year I closed my account with verizon and paid my final bill. Since then I have been checking my account regularly for any additional charges. I had a negative balance of $223 on my account, for which I received a check last week.
However, I received a letter in the mail yesterday from "NORTH SHORE AGENCY" stating that I had not paid my final bill since disconnecting my account and they are looking to collect an amount of $151.53 on behalf of Verizon.
I am confused, If i owed money in the first place then why did I receive a refund? Is this a scam?