Will these dark lines & worsened pigment from Pico laser go away? (Photo)

Hello. I’ve struggled for years with hyperpigmentation from post acne scarring. I tried Pico laser for the first time back in late December of last year. I saw minor improvement but overall no side effects. The second session the test raised the wavelength and that was February 10th. A little over a month since then & almost 3 months since the first session, I have dark lines from where the laser was performed & my back looks worse. The clinic claims it will fade…what should I do?