Each month I would pay the minimum + enough to cover any new purchase, plus a few $ extra. I assumed the payment above the minimum would be going to the higher-rate purchases. Admittedly I didn't pay close attention, as I didn't make many purchases, and I assumed based on revamped credit laws that it wouldn't be an issue. My experience with balances on other cards have always applied payments as expected.
I've since noticed that my balance subject to purchase interest rate has grown to several hundred dollars, and it is quite obvious that the extra payments were not being applied to the higher-rate purchases (or a best were being split proportionally between the purchases and the fixed-rate transfer.)
I tried calling tonight, got transferred to another dept, and then disconnected (probably closed for the evening.) Will try again in the AM, but wanted to see if others have had similar experiences.