3d convex polygon from connectivity list and vertices

i made 3d convex polygon

A=rand(10,3);

DT3 = delaunayTriangulation(A);

[C4,v4]= convexHull(DT3);

trisurf(C4,DT3.Points(:,1),DT3.Points(:,2),DT3.Points(:,3), ...

'FaceColor','w')

hold on

connect=C4;

e=[];

l=length( connect);

for i=1:l

connect1=connect(i,:);

a=connect1(1,1);

b=connect1(1,2);

c=connect1(1,3);

d=[DT3.Points(a,:);DT3.Points(b,:);DT3.Points(c,:)];

e=[e;d];

end

C4 is the connectivity list of polygons DT3.Points the vertices . i want to make the polygon back the reverse but few points connects to oher points and that connecting line comes inside the polygons .because i m making a new matrix from connectivity list

1 3 4

1 4 7

1 7 9

1 9 10

1 10 3

2 3 10

2 5 3

2 7 5

2 10 7

3 5 4

4 5 7

7 10 9

underlined 7 gets connected to 3 makes a line which is inside the polygon;

"Warning: Duplicate data points have been detected and removed.

The Triangulation indices are defined with respect to the unique set of points in delaunayTriangulation. "

becasue of the connectivity pattern and because i m not doing it right .how this can be solved ?