Hyundai Motor India said that the industrial relations at its factory in Sriperumbudur near Chennai was still challenging and a headache. ?Despite fulfilling all the obligations, a section of workers (small in number) continue to pose trouble for the auto major and we have no plans to reinstate anyone further,? said HMIL MD and CEO H W Park. Responding to questions on this issue, ?Enough is enough for us. We cannot tolerate anything further. We again reiterate and Hyundai cannot take those who have been sacked earlier. We agreed to take back 20 of the 87 sacked employees on the humanitarian ground and we did it. Still a section of workers continue to indulge in factory violation and we cannot tolerate anymore.?