Pork kg

Today around 07:15 I visited Boxer Superstore at Engcobo I went to the butchery side i was assisted by a guy he had no name bagde but was wearing a white apron on the apron there was a name that was written Thando. I was looking for pork,chicken and sausage. On the pork slot there was no meat just an orange paper indicating kg which was written 49,99 so I asked for a pork for R150 and there was another guy who was busy with cutting it so he weighed for me and then on the weighing machine the kg was 52,99. I asked him why the kg is different now from the one that is on the display he then just punched something on the weighing machine then the kg increased to 69,99 and then he asked me "so you want this one??" I said i dont know because i am asking why the kg is different am I wrong for asking then he said no and showed me the amount of the meat which was R190 he asked if it was ok I said no R150 then he weighed it and I did not have time to find more clarity as I was rushing for work. I was really not happy because even now i cannot tell which kg they are using because there were 3, 49,99 on the display 52,99 when the guy was first weighing the meat then 69,99 after i asked him why the kg is different from the one that is on display. Thank you