I had no problems with the Meta alarm installed in my Gen 3.5, until the insurance company decided to rip it out.....
There is pretty poor support from the company, and I had to e-mail the firm a couple of times to get the details of an approved supplier in my area, then beg an instuction manual off him.
I can only suggest that you check the boot, door and bonnet switches and that the ultrasonics are pointing into the central area of the car.
Failing that get them back, it should be under warranty.
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