You're right Paul, if there's a bad connection to any of the ABS sensors it will bring on the warning lights you mention because they're all integrated. It's possible they disturbed a cable when they did the brakes, it's also possible if they pushed the pistons back inside the calipers without opening the bleeders that old dirty fluid would go back up the lines and could eventually foul up the ABS valve block.
Best thing to do with it is to scan it for fault codes and find out which side the trouble lies with but you won't have to do anything with that yourself, just take it back and let them worry about it. The car should be under warranty especially for jobs they have done themselves. Let us know how you get on.
Edited by: Victor
2015 Antara Exclusiv 2.2 163ps Manual 2WD