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usually, prices are not protected... only rebates.
so let's say you have a $30 rebate on 12 months... this rebate will stay for this 12 months period... but if there's a price increase, you are very likely to get this price increase.
If this is infact a price increase, you should have received by email, mail or on your invoice an increase notice.
that said, call customer service... they will be able to explain it a little bit better.