We recently built a home and would like some advice regarding our marble shower floors and walls. We are well aware of the maintenance requirements of marble used in bathrooms. Our concern is moreso the quality of initial installation in a brand new home. We have

already had them replace tiles in floor and walls due to significant brown oxidation before ever turning the showet on. Then we had them replace floor tiles in the corner as water was accumulatng away from drain due to slope issuse. There is what I consoder significant lippage everywhere that they claim can be polished out. Could I get some opinions on the attached images? Thanks in advance.