damaged car

Automatic panel beaters are ********, they alter they check in reports and conveniently lose pictures. My car was booked in with them on the 17th of February a repair job that was suppose to take 10 days. Ended up taking 3weeks. On collection of my car I had notice deep scratches on my back fender and doors. On complaint of this I am now told that these damages were there, when asked for the photographs taken apparently they cannot see at the angle taken yet the assessor was thorough in his pictures every small dent and scratch he had photographed. I had informed th em that my front bumper is not aligned which was part of the job to be done now even that was existing damage again of you see in the report this was added in after signature as the assessor was thorough on his filling in of my docs. If something was not aligned he wrote in it was not aligned my front bumper check in was fine the only thing they had added now to the check in is crosses not even at the point of damage. The owner has a bad attitude he will not even speak to the customer and takes a decision based on how much he will lose yet damages was caused by his staff.