Barwtta 888 sold by commando

i have a '99 Maixima, and when i first installed this 2 way alarm, i had small problems such as not getting confirmation on the remote that the vehicle was armed, and if the 1st stage of the shock sensor was triggered, the warning tone would go forever untill i pulled the fuse. So i send it back to commando, and then send me a new one. I put the new one in: It automoatically starts going off after it does its little start-up flash sequence, and responds to NOTHING! While i hook it up, im inside my car with the door closed, no key in, sensor disconnected. The thing just goes off when it has power. Any ideas?? Commando says that its somehting on my end, but ive installed numerous alarms and H/U with no problems...just did a remote start on a tercel about 1 month ago. I dont like the fact that the install manual was photocopied and there is NO maufactuer contact information. What do you guys think i should do? i just want the stupid thing to work!