Disappointed with Nissan service at Secunda

I have been servicing my nissan micra at Nissan in Secunda since 2013 until now but this time they have broken the bolt for plugs and they just hide it never inform me. The car was on service on the 23-08-2021 for 195000 service. I saw the fault when I was checking the car cables because I saw the rat in the garage and I went to Nissan the technician who was working on the car he is denying that the bolt was broken at Nissan until I wanted to speak with a manager. The manager he said I must come back when I have a time they will fix it but now I not sure if I will pay for that after they finish to fix it.