Really sorry to hear all of that. When we were choosing stone two places from the many we visited steered us away from Neolith/porcelain (both carried the range), at one place another customer buying natural stone had a neighbour who had installed porcelain with similar issues that you have had. Infuriating is an understatement for a project that should be nothing but exciting and rewarding.
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Great simple space-measurement tips in one llace
Q