Thank you for your feedback, our Samuel Groves skillet is a very popular product and we are truly sorry to see that you are disappointed with it! Cooking with cast iron can be different from cooking with any other pans you've had before but we are here to help! Rust can be quite common when cooking with cast iron pans as the non-stick surface is all natural and not synthetic but it can easily be removed. As for the black residue, it's most likely food deposits, this happens when overheating of fats and oils in iron and it is not dangerous.
We will do our best to make it right, I have emailed you as I am sure we can resolve this issue together. Do not hesitate to contact us if you have any problems with your order: contact@buymeonce.com.