Dollartag/Thrifty Canada Deceptive and falsely accused by Mississauga, Ontario Canada

Rented car for the weekend, returned the car on at 5pm August 6, 2012.  At the return inspection, no issues were identified with the car.  Days later, their loss and recovery department contacted me and started sending me letters asking for payment of having to replacement a windshield and loss of business.  They sent me the claim file including an "accident report" supposedly to be filed by the customer which I had never filled out.  Their employee fills out the report with my information, indicated on the diagram where the damage was. 

It appears there was a crack on the driver side.  The attached photos indicated a rock chip and a crack but was on the passenger side.  As well there was another large rock chip on the what appears on the photo, the driver side.  I had never seen these damages before the photos and definitely have not incurred them.  These damages are very visible, it would have been impossible to miss at the return inspection.  The photos are also taken on August 7, 2012, I don't know what time. 

I feel ripoff because I had not incurred such damages as described by them when I returned the car.  The next thing I know I have photos of some car with such extensive damages to the windshield.  The loss recovery agent told me to provide my dispute/rebuttal to their head-office.  I pointed the time lapse where I did not have the car in my possession therefore would not be aware of what had incurred during that time.  Also the "accident report" they filed indicating the location of the damage did not match the photos they sent me.  After putting forth my dispute, the loss recovery agent forwarded me her message and my disputes. 

Her summary of my dispute simply said "it is quite standard -- she is responsible".  Should she have forwarded me her opinion along with my dispute.  It is clearly telling me irrelevant to what I have said or pointed out, just play along that head-office will review it but ultimately this is the decision?  What was the whole request for me to put for my dispute, just to satisfy their "standard procedure"?  Professional is lacking at this company plus their practice is very susceptible and shady.  I would not use them again nor the recently announced purchaser of dollartag/thrifty.  They will be the same shady group.