JEEP 6.4 SRT 2013 Engine

Hello everyone ✋🏻, got some issues with my jeep ( loud ticking noise with noticeable loss of power and sometimes failure to start) took it to a garage in Abudhabi and that what he sent back… any help 🤦🏼‍♂️ knowing that the car i recently bought it for 40k 🤷🏻