Horrible Service

I had a claim on my vehicle and reported it to Momentum. They have told me that my vehicle is uneconomical to repair hence written off. They then got back to me to say that all is in order and payout will be done however they say that my vehicle was previously damaged and not repaired properly hence they are now going to deduct from my payout. The other problem is that when I insured my vehicle, I pay extra on my premium for car hire. momentum arrange a vehicle from avis, however when my vehicle was written off, i was asked to return the hired vehicle because the claim was finalized. How doe I go out and buy another vehicle if I dont have transport. How do I get to work if I dont have transport. Does momentum expect me to buy the vehicle without evenm seeing it. This is not customer service.I want something done about this.