Hi the passenger door won’t unlock on my be golf 2004 it sometimes does but mostly doesn’t been told by a garage over the phone that I need a near side door catch but am unable to find where to get one any advice would be appreciated thanks 

Does sound like the door latch mechanism is playing up, best to get it sorted before it doesn't unlock and then you won't be able to get the door open to replace it.

I would try a scrapyard or ebay for a replacement (even if it is a used part, it may be better than you have already and good for the interim until you can source a new one