Had my Audi serviced at the main dealers in November and had the belt done at the same time along with a rear parking sensor.

Open the bonnet today (first time since) and find that they have slit the plastic engine cover - looks like someone tried to pull it off with a screw/bolt still in place

100% was not there before and spotted it instantly (it's glarringly obvious) and nobody has touch my car since.

Called the dealers but they said I need to speak to servicing when they are open on Monday.

So, naturally not happy, but what are the chances of them replacing it? given it has been 4 months since they did the work?