The first swarms left the hive and stopped in trees (i get them back, lost only one).
Later, with queen excluder, they stayed on the entrance and some minutes later went back.
I remembered i had still 3 hives on the field (couldn't take back to stock, cause african bees had reeinvaded). "Robbed" some combs, the african bees stil died (i had closed the entrance), and this way i could introduce some combs (without honey and eggs).
But it seems to be fixed, the bees are working on the combs now. Will see they will like also the "used" african combs.
Thanks for your help, will keep you informed!