Network parameters doesn't work, set up correct APN, reset network settings, connected to 4G but NO

My internet worked before, but one day it just suddenly stopped (after I ran out, though since then I've been gifted some bandwidth so I should be fine).
I did switch phones, but others who have my model (XIaomi Mi A2 Lite) said it worked with Fizz -- and it shows that it's connected to the network with full bars, just no internet access. As stated, I've tried sending the network parameters notification at least 3 times, but don't receive them.

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