Kempak, the Chameleon

About a month back I decided to re-tile my entire house. A friend said that he would approach Tony, the owner of Kempak Tiling, to obtain a quote for the job. Jaco, my contact, sent Tony a complete scope of work with area square meters and asked for two quotations. One with labour only and one with labour, glue and grout which I received. Maria, the office manager did the quote and I had to pay a deposit which I did. A week after payment to them, George, the supervisor, and two tilers with sidekicks came to my house and the scope of work was discussed in detail. This was the only time I saw George, never again!! The team started the job, and slowly, very slowly progressed up to about half way. Then they walked off the premises and never returned. After numerous phone calls to Maria, she informed me that the scope of the job is not what they expected and the first set of quotes are not valid anymore. I have all the facts on email. Kempak wants extra money immediately, which I paid and would send me a new quote which needs to be paid upfront covering the whole job to be done. I am not sure if I am stupid or ignorant but I have NEVER heard of full payment for a tile job upfront. The team from Kempak has ripped my wooden flooring to shreds, (I have the photographs), they have left half the job without washing the tiles or grouting them and Maria did not seem to care about my email to her personally confirming all the relevant facts. This company does tiling for huge business parks and shopping centers, so I have heard. Maria said they were very quiet when we approached them and could start immediately. Tony has never contacted me nor my friend who has dealt with them in the past. This was a terrible experience from a company who is supposedly perfectionistic. Not in my world!!