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My experience was that they do provide mail, internet, and phone options for declining the selection of the month. I have two occasions where selection of the month didn't come in the mail so I just logged in every 3 weeks just to stay on top of "decline selection." You will perpetually have to stay on top of this.
Long story short, they won't stop the "selection of the month" after you fulfill purchase commitment. In my case they abruptly cancelled my VIP Membership just because I asked for the "selection of the month" to stop so I have lost discounted ordering privileges.
I think a lot of sales are generated by shipping out product not ordered which is why; a) the selection of the month is shifted where they aren't on a regular monthly date and b) you can't stop the selection of the month and the friendly DMC goes very unfriendly if you approach this topic.