Horrible customer service!

Worst experience ever! My son, who is a minor was flying alone to PE. We got there in enough time to check-in but the queues were very long. He was priority boarding and at one stage there was only one person doing the check-in. It got to the point where they eventually asked all the PE staff to come in front of the line because boarding already started. During this time I asked if someone can assist my son to go to the gate because he didn't know where to go. The lady doing the check-in said there is no one to assist and he must go alone. Where she also told me that he is going to miss his plane! It wasn't his fault the queues were so long and so little staff behind the counter. I eventually got hold of one of the assistance and explained my predicament and she started yelling and said she is going crazy and there were minors standing by her as well. My son was nearly in tears. When we got to the lounge area where a lot of people were waiting for assistance and most of them were also flying to PE, there were about 4 people assisting. One staff member said she will take my son. By that time we had so much anxiety because the boarding was already 15 minutes in progress. That is how I had to say goodbye to my son. Another staff member yelled at a blind woman as well during this time, telling her to come they are late but doesn't bother to help her. She is blind, she couldn't see where she must go. The worst experience ever and it is totally unacceptable. It is not our fault there were so little staff at the check-in counter. They had no right to treat any of us in the manner that they did! Total unacceptable!