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The plan price doesn't go up unless a discount ends. Plan discounts are normally for either 12 or 24 months. Reps can give special discounts under certain circumstances, however, that can have any duration.
You can see breakdowns of your bills by signing into the HughesNet MyAccount website, then clicking on the "My Bill" header and either clicking on your current invoice or a past invoice, which will result in a popup window. You can then scroll down a little in that popup window and click on any of the links (in blue) to show a further breakdown of that particular charge.
You can compare invoices, and their particulars, to see why your bill has increased.