Read matrix and display as table - troubles doing a method for it - C#

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C#7.0

I have been trying to work around this method but the output I get it's not what I need.

When the program run at main I get to insert data into the array and after that should be able to create a table adding the data within. The problem is get a really bad formatation. Does anyone could tell what's the problem of the LISTDATA<t> method? I haven't got this one.

Sorry if I've forgotten any useful info and thanks for looking.

What I have tried:

public class Program
{
    private static void Main()
    {
        var client = new string[4, 7];
        InsertData<clientheader>(client);

        Console.Clear();
        InsertData<clientheader>(client);

        listData<clientheader>(client);
        Console.ReadKey();
    }

    static void showHeader<t>(string[,] matrix)
    {
        string line = new String('-', 83);
        int[] size = new int[] { 4, 10, 10, 15, 10, 10, 15 };
        Console.WriteLine(line);
        Console.Write("|");
        for (int i = 0; i < matrix.GetLength(1) - 1; i++)
        {
            string space = new String(' ', size[i] - GetHeader<t>(i).Length);
            string header = GetHeader<t>(i);
            Console.Write($"{header.ToUpper()}{space}");
            Console.Write("|");
        }
        Console.WriteLine();
    }

    static void listData<t>(string[,] matrix)
    {
        Console.Clear();
        showHeader<t>(matrix);

        string line = new String('-', 83);
        int[] size = new int[] { 10, 15, 15, 15, 15, 15, 15 };

        for (int i = 0; i < matrix.GetLength(0); i++)
        {
            Console.WriteLine(line);
            Console.Write("|");
            for (int j = 0; j < matrix.GetLength(1) - 1; j++)
            {
                if (matrix[i, j] == null) matrix[i, j] = "";
                string space = new String(' ', size[i] - matrix[i, j].Length - 1);
                Console.Write($"{matrix[i, j]}{space}");
                Console.Write("|");
            }
            Console.WriteLine();
        }
        Console.WriteLine(line);
    }

    static int getInsertIndex(string[,] matrix)
    {
        for (int j = 0; j < matrix.GetLength(0); j++)
        {
            if (string.IsNullOrEmpty(matrix[j, 0])) return j;
        }

        return -1;
    }

    private static void InsertData<t>(string[,] matrix)
    {
        int n = getInsertIndex(matrix), id = 1;

        matrix[n, 0] = Convert.ToString(id++);
        int x = matrix.GetLength(1) - 1;

        for (var j = 1; j < matrix.GetLength(1); j++)
        {
            do
            {
                Console.Write($"\nInsert {GetHeader<t>(j)}: ");
                matrix[n, j] = Console.ReadLine();
            } while (string.IsNullOrEmpty(matrix[0, j]));
        }
    }

    private static string GetHeader<t>(int i) => Enum.GetName(typeof(T), i);

    enum ClientHeader { Id, Name, Surname, Addres, CodPostal, Telephone, Email, State };


    }
}