No care for elderly customers

My great gran mother had a booking at 11:55 on 4 January 2020. We were unable to find parking and had to walk the entire OR Tambo to get to check in. We arrived at 11:30 and were told she cannot board the flight because she was not 40 minutes early. We were treated very rudely with a staff member even asking us to leave while we were waiting for assistance because he said we had been there for a while. The staff are very rude and unhelpful. I was also told to change the ticket to the next flight I must pay on R300, and when I went to change the flight booking I was charged R450 without even knowing until it was too late. First and last time using FlySafair. Worst service ever and they are more into making money than retaining customers.