Contact support. I know someone that was in the same situtation. And the members of the group used the information of her being founder to see that she was online and harass her. She left the grop because they were harassing her. She didn't know they could still see her online status because she was founder of the group.The founder should be able to delete the group, they are the ones that paid money to creat the group. My friend did get the group back, ejected everyone and deleted the group.
File a support ticket.