That's just how it usually works. Looks as if you are still in the "new customer discount" contract, period?
If so it will go up to the standard rate for that package when that period ends. Changing packages usually starts a new contract. You can see what that price is on the "shop" website or look at you contract.
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.