@Jessica
Wont connect to what?
Your WiFi, or the Now stick/box/app?
And which is it you are trying to connect to?
And when you say changed your WiFi, how exactly?
It is possible to get into a situation where only a physical remote will suffice, but normally only when you have hard reset the Now device.
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Please bear in mind that generally we are all customers like you, and so can’t help with billing or other queries that only Now can answer. We can try to point you in the right direction though.