Huggalugs review for Advanced Shipping Rates

This originally worked well, but suddenly stopped calculating and allowed orders to be submitted with low shipping calculations. Now it has happened again. The last time the owners didn't even refund their monthly fee to me even after I asked and lost a lot of $$ in shipping costs. Now it has happended a second time and I'm fed up. Don't bother wasting your time with this app. HORRIBLE!!!