Hassles after a car accident!!

[FRDGAL]

I only just read my mail (at 12.30am - it was in the car and I forgot all about it) and here's the story. In February, I was hit by a taxi. He reversed into my front end at full pelt. A gentleman that witnessed this came over to me, told me he saw the taxi reverse into me and handed me his business card etc and so on. So I have a witness. I claimed through my Insurance (Just Car) and after filing a police report everything was fine, I had the car repaired and that was that. Or so I thought...........

But now, I get a letter in the mail with attachment copies of assessor reports and quotes from a panel shop. The taxi driver's insurance company is claiming that I am responsible for the accident and the panel shop's quote has written "we found that it had been hit in the rear" :

2 months after the accident, they want me to pay a total of $882.83 for damages to the taxi. Damages that I apparently caused.

I haven't been through this before so what do I do? Do I ring my Insurance company and have them battle it out or do I seek legal advice? I thought him reversing into to me would make it his fault but am I partially at fault somehow without knowing it? Also, the name of the taxi driver according to this letter differs from the name that the driver himself wrote out for me :

So, if you've ever had an accident that wasn't your fault and have been through a situation like mine, then some advice would be greatly appreciated.

As if I don't have enough problems.................... :