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Thanks all, wow quick responses! :)
boxtops - funnily enough, that's exactly what I did (great minds... :)). The thing that worries me is that I only cancelled the DD today (online), and my bank said the cancellation could take up to 3 days to process, and the CC site said up to 8 days! It's not a huge problem, I won't go overdrawn or anything, I'm just incredibly lazy and am hoping not to have the hassle of chasing them for my money back :)
dzug - thanks for your response, too - I paid it off about 10 days ago, and it shows on their own website as paid...guess it just depends on their individual system as you say...
ummmm - I didn't have an outstanding balance last month, so interest's not a problem, but I think I'll call my bank and the CC company just to make doubly sure! :)
Thanks again all, have a great day!
GL