Gap between plastic front panel and metal band

hello, i have noticed a gap between the front plastic and the metal band when taking the iphone off a case. theres a 1mm gap between the plastic and metal, and 3 small cracks along the edge of the plastic, 2 at the top and 1 at the right side. the gap is at the top of the phone from the power button to the edge. the front glass doesnt fit perfectly anymore because the top end of the plastic is raised whilst the rest is flat.

how do i get it repaired?

thx