clifford concept 500 problems?

The alarm is fitted to an Astra g 1.6. This was working fine until sunday afternoon when i armed it and there were no chirps, the alarm armed but the was constantly going off and wouldnt disarm, i pressed the button the doors opened and the siren kept going off and the doors relocked themselves again. Arming and disarming there are no chirps. I have checked the activation memory and it states door ajar but everything looks fine. I have tried using the buttons inside the car to try and adjust the chirps but there is no response to this and also isnt chirping when it should.
Can anyone please help me??