I had a PicoSure tattoo removal, and the setting was far too high. What about scarring, burn consequences, lymphatic etc.?

The clinic admitted their mistake. They had the setting as if I had multiple treatments done already. I left in unbearable pain, and 1 week later my skin is burned red still, blisters and very painful still. I had other treatments before on other tattoos and it was nothing like this. They had the settings as if all treatments had been done on this tattoo and they weren't. What are complications to having settings far too high and it is also a very large tattoo (half my back).