Worst client service and claims ever.

The worst service I received from an insurance company. I claim damages to my vehicle, went for the assessment as requested by them. I then was informed via telephone and a E-mail that claim has been approved. then booked the vehicle as arrange, on the day the vehicle was booked in the repairer contacted me and informed me only half the claim has been approved , but he will load the other damage as additional. i had to collect the vehicle due to transportation reason as the other half of the claim has not been approved yet . It has been a month now with constant calling their center to follow up on the claim. The only answer i receive from them it is with the assessor department.