Insurance company doesnt want to pay!!!?

I was struck by an uninsured driver on 02-10-11. Because the driver who struck me was uninsured I was forced to file a claim with my insurance company(Omni Insurance). The car was towed to CJ's collision at 6128 n beechwood Philadelphia, pa ,19138 on 02-11-11. Phone number 215-848-2836. On 02-14-11 Omni insurance sent out an appraiser to evaluate the vehicle. They then faxed an estimate on 02-15-11 totaling $5300 to CJ's collision shop. I went to the collision shop on 02-15-11 to sign paperwork giving them permission to work on my car. They then began the repairs. On 02-18-11 the insurance company then deemed my car a total loss. The vehicle is a 2005 Nissan Altima SL with 96,477 miles. The NADA value for the vehicle is 10,995. According to Omni insurance a car is deemed a total loss when the repairs reach 70% of the value of the vehicle. Omni insurance valued my car at 7,415. They then proposed a settlement offer of 5826.40. They deducted 975.00 in prior damages(which I disagree with) and 1000.00 my deductible. The settlement offer included 386.40 in sales tax. After negotiating on 02-28-11 they proposed an offer of 7835.30. The value they gave my car was 9255. Again 975.00 was deducted and my 1000.00 deductible. They including sales tax and tags/registration fee in the offer. I accepted the offer out of desperation because they also stopped paying for the rental car I was driving on 02-28-11. I work, attend school and have a child my schedule requires that I have a car so I paid out of pocket for a rental car until 03-07-11, expecting the payment to be issued to my lien holder by then so I could purchase another car. I contacted them on 03-07-11 inquiring about my payment and was informed they did not pick the vehicle up from the collision shop therefore they were not issuing a payment. The collision shop gave them a bill of 1750.00 for the repairs they did and the storage fees. The insurance company disagrees with this and refuses to pick the vehicle up and issue my payment. They have also stated this may come out of my settlement offer. The insurance company already has the title to the car and all the necessary paperwork to the vehicle but refuses to issue a payment. It has been a month since I filed my claim and I can no longer afford to pay for a rental especially since it seems I will have to purchase a new vehicle. The insurance company is low balling me and also forcing me to pay for repairs they approved then backed out of.