valentine and kebartas illegal collections and harrassing calls lawrence, Massachusetts

I ordered a computer through Dell back in Feb 2008 and used my mother's DELL account to order the computer.  Both my mom and I spoke with the DELL rep and so I did have my mom's permission to use the account and buy the computer and make the monthly payments.  I made the monthly payments of $120 per month on the account but fell behind a few months because money was tight and my hours were cut at my job.  Then things started picking up at work and I got more hours and more money so I got caught up on the payments and made the last payment in May 2009.  Then in Nov of 2009 I received a call from V&K that my account was turned over to them for collections and that I owed $2700 on the account.  I told them that this is not true that the account is paid off and that I owe nothing on the account and for them to stop calling me and I hung up.  I received a call back 5 minutes later and was told that I used the account fraudulently and that they will call the local police and have me arrested and have the house and car seized unless I make payment arrangements.  I was not scared into doing that.  I told the rep that called and said that I have video proof that both my mom and I spoke with the Dell rep and that I had permission to use the account to purchase a computer.  I even have the printed out receipts that the computer is paid for.  I told the rep that if the company tries anything like getting me arrested to seizing the house and car that I will call my uncle (who works for the government and has friends in high places and that is true) will contact their local state attorney's office and have them investigated for illegal collection activity.  I have also called Dell and received a letter in the mail that I do not owe any money on the account and that Valentine and Kebartas is no longer used as their collection agency.  I have not received a call since then.