I used to work on a tech support hotline for a ISP 10 years ago and that was the usual thing.
My shit's slow
Ok, I see you've got perfect parameters for your ADSL, I just logged into your router, trying out download... and upload... It works exactly as it should, so maybe your WiFi? Could you connect a wire?
Plz come fix asap, TECHNICIAN VISIT WHEN??!!
If the WiFi sucked on router provided as part of the service then sure, I could send a technician, but usually the router only had one ethernet port.