Simowrx

Hi wondered if anyone could shed some light on my locking issues had my 04 Impreza wrx for 3 months key fob wasn't working when I got it but I replaced the battery and all was well but after a few weeks it started playing up I bought another fob and programmed it to the car all was fine then a few days later both fobs stopped working altogether so I'm having to lock it with the key it has the 2 button alpha corp system it was suggested the body integrated unit was faulty so I have replaced that but still won't work I have tried reprogramming both key fobs but doesn't seem to go into programming mode it has the 2 connectors behind the drivers kick panel and doesn't have a keypad I found it has another unit the keyless control unit but when I spoke to Subaru they hadn't sold one since 2010 and the customer returned it as it wasn't the problem suggesting it wasn't a common part to fail any help appreciated