What current Hub model do you have ? Is there a single SSID and password? If so ask the Tech to alter the SSID of the new Hub to be the same as the current one and at the same time change the password to the one you currently use - should all then be fine, Its also straightforward to do yourself by logging in post visit.
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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, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.