Completion date forever being moved

I took my car for the hail repairs to the above supplier as referred to by my insurance company (MiWay) on the 13th January 2016.<br> <br> Initially, I was told that the completion date will be the 12th February 2016, on the 08th February I was then told that the completion date is then the 19th February. On the 19th February, the completion date was then moved to the 26th of February.<br> <br> Also bearing in mind that I had to return the insurance rented car on the 14th of February, I have been inconvenienced both financially and emotionally as I had to make other means of going to work from the 14th up to date. <br> <br> I would like to have the fully repaired car back by Wednesday 24th February 2016, as I will have no other means of transport from then.