What to do if an insurer's client struck my vehicle but they want me to pay for a rental?

Question Details: A insurer's client struck my vehicle from behind and on side pushing my truck while legally parked in lined parking space. The driver refused to provide info after I caught up with him. After calling Allstate they said I would have to pay a deposit for a car rental they won't pay and they'll only pay for rental when the parts come in only. This means I'll be without a vehicle for a week or more while auto shop has my vehicle, I have to pay for rental up to day parts come in, I have to pay for insurance, etc. They won't pay. Are they allowed to do this? Is this a way for them to get out of paying for rental? Why don't they have their own rentals and self-insurance?

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