New Battery fitted on customers vehicle by RAC. No prior faults previously. Customer reported battery was completely flat with no voltage at all when RAC attended.

Roof and Seats now fail to work and numerous other faults.

Using VCDS, unable to open control modules with fault codes.

Tried deleting codes but they return straight away.

Disconnecting and recoding battery would be very much a last resort.

Can anyone steer me in the right direction?

Cheers,
Ian