Wrong course data not being corrected

Several Golf Courses in my region seem to have outdated maps. (DE- GolfCity Puhlheim, DE - Rittergut Birkhof (Am Römerweg), DE - Friehlinghausen). I did report all of them but I did not get an confirmation about my report. After > 1 month waiting the courses have not been updated either. What should i do to get correct data for these courses? 

(Original post was in the German S62 Forum. Reposting it here for to reach a wider audience.)