Impact Tiling

we had our bathroom tiled an grouted, we supplied top quality tiles some at £170 per Sq metre. the tiling it self was ok, the lines and cuts could have been better but i could live with it, the grouting however was terrible, and as it was done on a hot day we arranged for him to come back another on another occasion to go over it an sort out what needed sorting… some time went by an after arranging for him to turn up around 10 times to which he always failed & stopped answering the phone to us. the grout is cracking an not even filled in in places an looks terrible! There’s adhesive haze all over the tiles where somone did not sponge them off, To add to that 3 of the floor tiles he laid have come loose from just walking over them. we are now afraid to drill our new toilet & sink down incase the rest come up from the vibration as its like somone has cellotaped them to the floor. We was expecting a top job to be done but have been let down & dissapointed after paying out good money