Topper Harley

Hi bit of a noobie to alarms but have a good general understanding. I've purchased and installed a Galaxy Flex 20 panel with the RF portal, PIR's are all wired, shock and door sensors run over RF. I have two problems, one of the PIR's constantly keeps triggering the alarm randomly when set, it's located in the living room facing the rear french doors, after speaking to some people they believe the sensor is faulty. Could it be this or the sensitivity, I have no pets. Second issue is that I realised after buying and installing it, the system is designed to dial out to monitoring centres etc. What I want is the system to dial my or my wife's mobile or the ability for it to send a text with some details in it. Ideally any remote software to be able to rest the alarm or re-arm would be great, Honeywell market all these things but it seems more challenging to find any details on how this is achieved. I would like to be able to use what I've got or add some sort of module that would allow me to achieve the above. I wish I purchased a comfort system now, has so many more options. Worst case scenario would be to pay for a monitoring service that is reliable and doesn't cost the earth. Any help would be appreciated on this. Thanks