I haven't heard that one before
I guess if he isn't doing anything wrong then you're just going to have to let him be though that is strange indeed.
maybe they think they still be constantly covered by any Moneyback Guarantee as these are new orders each month.
Doesn't sound like this is the case as he has been with him for a year now. I am sure if he was claiming a refund every month @cheapdedicated would have caught on by now :p