S6 C6 Battery Drain

Hello everyone, I recently had my windscreen changed due to large crack but ever since it being done I have a serious battery drain. My fiancé took the car to have the work done and drove home fine (bar the misfire at idle). The following day I tried to go out and the car was completely dead, I have since bought a new battery but still the same, new battery lasted around 48 hours with being driven for a total of 3 hours. I have checked there’s no interior lights on when the car is off. There is no fuse for the auto wipers and I have turned the headlights to off. Is there any common battery drains or anything else I can try before I loose my mind?