My dissertation is just for an undergraduate degree, but acknowledgements are required. I have sent two direct emails to the internal supervisor who was assigned to me, one introducing myself and one asking for advice. There have also been several emails where they have been copied into, just to keep them up to date with my progress.
I plan to acknowledge and thank other staff members (academics and counsellor), my external supervisor and a friend.
I have never received a reply from this internal supervisor. Do I have to acknowledge them if they've never bothered to respond to a single email let alone help in any way? Alternatively, or perhaps additionally, I'm considering excluding them altogether from the title page and cover sheet where I'm required to name my supervisors.
EDIT: Just wanted to thank everyone for their insight and suggestions. I'm still considering which path to take and in the meantime I have mentioned the lack of response to my course leader again, just in case there's still an alternative route at this point.