char * UserData[4] = { new char[50], new char[50], new char[13], new char[4] };
char *** phoneBook = new char ** [10];

phoneBook[0] = UserData;
gets(UserData[0]);
gets(UserData[1]);
gets(UserData[2]);
gets(UserData[3]);

cout << phoneBook[0][2] << " Test string 1nn"; // Вывод стоки, здесь все хорошо.

phoneBook[1] = UserData;
gets(UserData[0]);
gets(UserData[1]);
gets(UserData[2]);
gets(UserData[3]);

// Вывод стоки, здесь всё хорошо.
cout << phoneBook[1][3] << " Test string 2nn";
// Значение перезаписалось! Почему?
cout << phoneBook[0][2] << " Test string 1nn WHY IS IT CHANGING???";

phoneBook[0] = UserData;
phoneBook[1] = UserData;

struct phoneBookStruct{
 char UserData0[50];
 char UserData1[50];
 char UserData2[13];
 char UserData3[4];
}

phoneBookStruct phoneBook[10];

gets(phoneBook[0].UserData0);
gets(phoneBook[0].UserData1);
gets(phoneBook[0].UserData2);
gets(phoneBook[0].UserData3);

cout<<phoneBook[0].UserData0<<" Testing"<<endl;

gets(phoneBook[1].UserData0);
gets(phoneBook[1].UserData1);
gets(phoneBook[1].UserData2);
gets(phoneBook[1].UserData3);

cout<<phoneBook[1].UserData0<<" Testing"<<endl;

phoneBook[0] = UserData;
phoneBook[1] = UserData;