Changing flights without contact

We went to Cape Town to visit my brother on 11 March. we returned on Sunday the 14th and our flight had been moved. when i asked the flight office, i was informed that they have sent me an email to update the times. NO ONE checks email when on holiday. Do you mean to tell me that not a single person at Mango could have picked up the phone and called the clients? I was not the only person in this situation on Sunday.