sent black wax to rub on stain on star galaxy?

hi, have just today received some black lumpy wax sent to my by the people who installed my granite as i had complained to them that there was a white stain appeared, only had three weeks they said i had spilt something acidic on it, and it has reacted with sealer, and told me that they would send me wax to rub on and rub off with a soft wire brush was very surprised when the wax turned up and was black, shorly this is only trying to cover the stain not remove it. have got them coming monday to look. should i get them to remove sealer and will granite still look the same?