Help, waxing burned my skin

Hey everyone, I have been waxing/ threading for years but yesterday I had a really bad experience that has left my with painful burns on my face . If the area was small I may have not been so upset however these are extremely visible and very big . Also I did not do it myself and went to a waxing bar however when I left my face felt pretty irritated and with in an hour I had turned red , so I went back and they gave me a calming solution and a high frequency treatment. I am very prone to scaring and pigmentation. I really am avoiding scaring do you know what I should do ?