In this day and age apparently we still need a cable to connect to a router?

According to MZee at the technical department I need a cable to connect to the router to get an accurate speed-test. I'm working on a MacBook Air that do not have a cable port (this is the 21 century, is it not). If OpenServe is dispatched to fix and find no fault via their connection with a cable directly to the router, apparently I will be charged. When I started my account with Mweb, no-one stated that I'll need a laptop with cable connection abilities, as my test speed will not be accurate with a Wi-Fi connection. I was then transferred to Charlo at the cancelation department, who seriously had an indifferent attitude towards me and my complaint and seriously did not care if I cancel because of horrific service. He gets a salary ever month, why would he be bothered if Mweb looses my business. After many years of being with Mweb, it seems I am in the market for an internet business that actually care about service delivery.