@kadin 
To override an autowired service in Symfony, you can follow these steps:
1 2 3 4 5 6  | 
use AppServiceOriginalService;
class OverriddenService extends OriginalService
{
    // custom implementation
}
 | 
1 2 3  | 
services:
    AppServiceOriginalService:
        class: AppServiceOverriddenService
 | 
1
 | 
bin/console cache:clear  | 
After performing the above steps, whenever you autowire the original service in your code, Symfony will use the overridden service instead.