Rotten free range eggs

One week ago bought36x2 eggs in open tray from Grass roof as we done many times before.Eggs were free range at R86/ tray and put in fridge immediately when we got home.Too my dissapointnent three of the first egss were bad with black mould sticking inside shell.Phoned to complain and managaress said i needed receipt as proof.This i dont have because who keeps eggs receipt.Took photos of bad eggs as well and told managaress i could come and show her plus rotten eggs in dish but she was not interested.Never againMike Pow Chong***