De or het serviceafdeling?

The correct Dutch article is:

de serviceafdeling

Rule Words ending in -ing: almost always de. See the rule

How to use serviceafdeling

the serviceafdelingde serviceafdeling
this serviceafdelingdeze serviceafdeling
that serviceafdelingdie serviceafdeling
our serviceafdelingonze serviceafdeling
your serviceafdelingjouw serviceafdeling
every serviceafdelingelke serviceafdeling
which serviceafdeling?welke serviceafdeling?
a big serviceafdeling / the big serviceafdelingeen grote serviceafdeling, de grote serviceafdeling