Key wont de-activate the alarm on my Golf Mk4 1.6 Match?

Hi, got an issue with my mk4 alarm, the remote doesn't work at all, got a signal light but from the fob but thats it, key works fine but if I don't switch the ignition on immediately the alarm goes off, so while using the key opens all the locks, it doesn't deactivate the alarm. HELP!!!!!!!!!