Atlantic Publishers Group Billed me for a magazine I was already making installment payments on...I didn't want to have my subscription cancelled Niwot Colorado

I have been making installment payments for a magazine I have been ordering for several years.  I knew I still had payments due so when I got the notice in the mail...I made another payment.  Then I just got a notice that I only owed $ 8.70 so I paid that on line.  A few days later...I got another notice saying I owed $ 119.95 and that they just processed my last payment of $ 40.00.  It looks like I am paying both companies! When I went on line to check this company...the Ripoff Page came up.  I am so upset.  I am on a fixed income and never thought this would happen to me! I just wanted to make sure I didn't lose my subscription!