Takoradi is not mapped as an area. If they are referring to the district (admin) boundaries, then that's a totally different thing. 

It's possible to have multiple districts dividing a city. Nevertheless, the district boundaries on OSM currently are also not entirely accurate (based on places I know). 

It could be that your users are mistaking district boundaries for city/town boundaries, as the location where the note is placed is certainly Takoradi, or the boundary is incorrectly mapped. Though the boundary on OSM matches what's on Wikipedia (https://upload.wikimedia.org/wikipedia/commons/9/94/Districts_of_the_Western_Region_%282019%29.png).

There are no available sources to compare, as you've encountered.