Literary Guild Select Books

I have canceled my account numerous times because of the slow process in receiving the new titles. Other stores received their books the day they are released. Literary Guild Select books are received 1 to 2 weeks after they hit the street. By the time I receive the best sellers from LG I have already bought a copy from BJ's or Sams.

I am still getting books even though I have canceled my subscription. I have returned some but the last two I refuse to return because it is time consuming. How do I stop the materials from coming?