Personal temperature is subjective, so what do you expect from the dash vents? ATS should have been shown U the temps at the vents
An idea of the output temperature from the dash vents with the system switched to ‘air recirculating’ and blower on full, plus what the outside ambient temp is would be handy, as the output temp varies with the ambient.
A climate controlled system is more involved, than a manual system which my disco is fitted, but with the recent warm weather my disco was putting out 6C to 7C with an ambient of 31C, so I’m happy with that for my 23 year vehicle.
There are many opportunities to have vehicle AC recharged, main dealerships, garages, tyre and exhaust centres, even DIY at Halfords and almost any fool can add some extra refrigerant and make the car cooler - at least temporarily. The expertise is to ensure that the vehicle stays that way.
That expertise is found only in those company’s that staff spend years of their working life doing nothing but vehicle air conditioning and also with the specialised tools necessary to detect leaks or to diagnose other AC faults.
So if your unhappy with the dash vent output, then find a local Vehicle Air Condition only company and take your disco there.