Finding legit editing services in countries like Nigeria is actually not so easy. I have no doubt there are many professional academic editors across Africa, but as part of the publishing ecosystem they are not so visible as in the mainstream regions of English-based research.
There is a real need for affordable, locally-based, services in Africa – so scams like this may be most annoying for researchers based in Nigeria itself.
One goal of the Research Cooperative network I have established (http://researchcooperative.org) is to try and shine a light on the real editors and proofreaders in Africa and other regions where services are most needed and least available.