Heat oil over medium heat in a large pot. Add onions, carrots, celery and garlic. Saute for about 10 minutes until vegetables begin to brown. Increase the heat to high and add the pancetta. Saute for 3 minutes. Add the meatloaf mix and the ground pork and continue to cook until meat is no longer pink, breaking up meat with a fork. Add the milk and cook, stirring often until most of the milk is cooked down, about 15 minutes. Add the tomatoes, chicken stock and white wine. Reduce heat to medium low and simmer for 1 hour, uncovered, stirring occasionally. Add the tomato paste and mix until incorporated. Continue to cook for 20 more minutes. Season with the salt and pepper.