How to remove a UDA folder?

Hi

I'm running into an anoying issue here.

We have deployed a UDA called 4years online archive to our users.

As we do have some vip users we also created a UDA folder 8 years online to deploy to our vips.

So our vips see only there 8 year uda folder and most of the standaard users are seeing there 4 year UDA folder as it should be

By accident we added a few people in the 8 year UDA activity who should been in there.

So they see both the 4year & 8 year folder

We already adjusted the activity, however we  can' t seem to get the folder remvoed from the users mailbox;

Any sugestions?

thnx