The new router will certainly improve your wifi.
You need to call in and follow options 1,1,4,4, and see what they say. call at 08.00 (09.00 Sun).
They are becoming more reluctant to offer big savings because after all, you have already had that saving for 18(?) months, over the price that the rest of us are paying. They may offer you a speed increase for the new price or something like that,
So you may have to be prepared to leave for anther provider and come back whenever you can to get a better deal.
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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.