New wifi not connecting to wired camera’s

Hi all Please help , I’ve recently changed my internet provider from BT and now on Talk Talk and since then I’ve been unable to reconnect all 3 of my wired camera’s to the wifi - I’ve rebooted internet , I’ve rebooted the camera’s and even moved the camera out of normal location to be closer to the wifi hub - then I’ve been informed I need to use 2.4mhz and not the 5mhz so I have also acquired a extender and this also doesn’t work …..please help any more tips or tricks will be very much appreciated.