It looks like no tanking has been done at all, what products have they got on site in the way of adhesive, grout and tanking, as has been said, don't let them do anything else, apart from strip off the bodge job that they have done already, once the tiles are off, send them packing, you will have to clean the tiles / wall yourself but hey ho, a learning curve, in your original thread, I thought you were going to go with a pro after all the to ing and fro ing and advice ????