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I’ve lost my patience with this thing lol Bought a portable printer and would like help to set it up and maybe the wifi extender too please

Two printers that would print and scan over wifi worked fine. Optus replaced the wifi box, shouted a lot, did no testing, did no wifi speed measuring, reported wifi levels as poor at a time my wife was tethered to her phone - and were rude and unhelpful. When the guy had gone we found that neither printer worked on wifi for either printing or scanning. We would like both features on both printers to work,. We can wire the printers to laptops for printing, but wiring does not allow scanning. I will pay cash so I do not need to provide credit card details. The wfi is already live within the house do I see no need to connect to your computer. Please explain. - Due date: Flexible