Can you all get back on topic please, we know this is a disgraceful job. Have you contacted the company regarding this? and if so what was the response? Secondly I am assuming you have paid in full for the work, and if so, was this before or at the completion of the installation? Thirdly send a letter recorded delivery with the photographs, and state that you want the whole of the amount of tiling, rectified, or you will be going down the legal route.
You have to do this immediately, without delay, and I cannot stress this strongly enough.
Pebbs