Opel Corsa-C Remote For Central Door Locking Not Working

I have a little problem with a Corsa C 1.0 2002

It has just 1 key which unlocks doors fine & starts car no problem, so IMMO & central locking is working OK

Problem is the remote buttons on the key aren't unlocking or locking the doors when pressed

Both micro switches are activating the LED when pressed

If I erase the key remote in OP-COM via BCM programming & then program/resync it again it asks me to press one of the remote buttons. When I do so it cycles the locks & says programmed successfully but still the fooker don't work

I have tried a second hand BCM today but no difference, also I had to replace one of the micro switches on the key as the old one was damaged by the worn casing which I also changed

So thought I'd ask you guys for help here as keys ain't really my thing

Thanks in advance for any advice you guys have