Audi RS5

Evening folks

So i purchased an Audi Rs5 2018 from Audi Eastbourne in March this year.

It has the 12 month audi warranty and i paid for another 12 months on top of that up front.

I dont think i have done 2500 miles since i have had it and i have now had to take it to my local dealership because i have been getting an error with the sports diff warning light to come on.
Its taken them two days to diagnose the issue (if they have) and now they say they need to order a load of parts for it but are waiting authority from the audi warranty people - surely this should be covered without issue ?

Also they say the rear spring off side has broken - i get that its not a new car but given the mileage eg 34000 when i bought it i would think that should be covered as well ?

Thoughts please folks ?

Thanks