bangbang23

Hey guys.

Im new to this forum and have a major issue with my keys.

Firstly hi.

I have a A4 B7 model and I have two sets of keys that have recently lost synchronization to open and lock my car.
I replaced the battery and re-synchronized (following the manuel) and nothing happened.
I rang Audi and they informed me that i need a new key...
Is there anywhere I can take these keys to get fixed?
Or do i have to buy a new key?
Is there anything I can do myself?
The keys themselves are still operating as I can see the small red light still lights up when i press the lock/unlock buttons.

Any help would be much appreciated!!!