Konkan Railway — 6 people in our 1A compartment instead of 4

My family (2 adults/1 teenager) took 10112 Konkan Kanya Express on 21 Jan 2017 from Goa to Mumbai. Our three tickets on First Class AC cost INR6756.

Our complaints:
1. There were no signs telling us which compartment was ours. By the time we were on the train an Indian couple had occupied the first compartment so we took the 2nd one. The 3rd one only had two beds. Then our tickets were controlled and we were told to move to the first compartment. By that time the Indian couple had moved to the 3rd one. However, we were not told which beds to occupy so we took the bottom two plus an upper level. We were told that at 10.30pm "a passenger" would join us.
2. While we had already gone to bed, A WOMAN AND HER TWO CHILDREN came into the compartment with three men, one of them probably the husband. She said that she should have one bottom bed. Then someone from the Rail Company came with a pile of lists and said that her bed was number 1, yet there was no sign at all with any names on any areas of the compartment/carriage/train.
3. When we asked how the compartment could take up three more people we were told that only one person was joining. We counted six with her children but the Rail staff kept insisting that it was only one person.
THIS IS EXTREMELY UNFAIR TO US AS WE PAID FOR ONE PERSON ONE BED!!!