Either your OC is saying you have cracked paint and therefore that’s your responsibility or that the repair is a mere patch in the structure which they are responsible.
A lot of owners do simple patch job themselves which is not rocket science but I suppose you are legally entitled to have them do it.
I had to organise a repair on cracked common walls but they had a combination of cracks more than 5mm which required helibars to stabilise the structure and patch putty the areas that didn’t need the metal reinforcers. We also painted what was fixed.