You got a discount for 12 months upon joining. Now you are being asked to pay the full price that everyone else is paying for the same package. Seems fair.
If you want a better price then you are right to go to Sky. After 12 months of introductory discount they will increase your price to that that all other customers are paying. Seems fair.
Then you can move to another supplier for another 12 months discount package.
Its what the regulators intended -- to increase competition in the market. Just how it works.
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John
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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. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.