I recently returned from mat leave. Have been at my employer for 4 years now.I'm back part time. My maternity cover person was made permanent and has been promoted up a level. I think the new role is basically the same as the old one with a better job title! It seems unfair as I was never made aware that such a role was available, and have made it clear in the past that I wished to be considered for promotion. Where do I stand? Do I have grounds for a complaint? My part time status is on a 6 month trial basis.