What Hub model is it? If a Hub4 - thats wifi 5 - and unlikely to deliver more than ~500 on one wifi device. What do you get on an ethernet cable connection?
Try this to reset the password
Do a Hub “pinhole reset” - first make sure the 2 passwords on the Hub sticker are still there and legible first ! With the Hub still "switched on" throughout, press the reset pin in firmly with paper clip/SIM tray tool or similar "thin thing" and hold it firmly for at least 60 (a timed sixty) seconds, release the pin, leave for 5’ to stabilise - dont manually switch it off at any time.
Passwords and SSID’s will reset to those on the sticker so log in and change them back to what they were/should be. Note there are 2 passwords - one for wifi and the other is to log into the Hub.
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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.