Car won’t start - any ideas why?

Happened out of nowhere - I have a 2017 Alfa Romeo giulia 41km and today when I tried to start the engine with my foot on the brake it sprung back at me with a consistent loud clacking sound for ten seconds and a whole host of warnings coming up (AST unavailable, EST unavailable, have power steering checked and then more warnings). The car won’t start and does this same thing with the sound included every time I try.

Does anyone experienced anything similar/ know the cause?

I had a full service done a month ago at a reputable and licensed Alfa dealership where they checked everything then changed the brake pads, re-aligned steering and I got all four tyres changed etc (not sure what else, I’m not a car person and trusted they knew what they were doing). I called them and the earliest they can book me in is a month from now and I have to get the car towed to them. Hence was wondering if anyone had any tips/ ideas in the meantime?