u/Emergency-Scheme-153

We have had a bathroom renovation in the UK. We have had issues with the contractor already incorrectly applying epoxy grout causing hazing issues. We are trying to fix this and also noticed small holes or irregularities in the grout. Would you suggest these holes are going to cause issues? I don't know if they would cause problems and whether it is worth asking the service to fix them. Any help appreciated as we don't know what is a good job or a bad job anymore!!