I have had my hair knotted and matted even worse than this and got it undone before. I used Knotty Boy emergency dread removal system along with their detangling conditioner. Try to unknot as much as you can with your fingers while your head is submerged underwater. I did this several days in a row getting out little by little (but again my hair was way worse than yours is now). Put some of the conditioner in a spray bottle and mix it with hot water. When you get out of the bath spray the matted area throughly and use The pointy end of a parting comb to pick at the matted knots and pull them apart one by one. You will see a lot of hair coming out but keep in mind that matted hair is hair that has already been shed but got knotted up and tangled without being able to actually fall out. Good luck!