can i get paid for deminish value of my car and cost rental

If your vehicle was repairable than the insurance company is supposed to pay for a rental car while your vehicle is actually being repaired.  I suggest that you consult with the Maryland Insurance Administration if the insurance company is refusing to pay for your rental car. If you can prove a diminished value as to your vehicle after the repairs have been completed, then yes you can potentially be paid for a diminished value claim.  You will need written documentation as to the diminished value from someone like a property damage appraiser. Good luck with this matter.