Need help on updating huge amount of tickets in Zoho Desk

Need help on updating huge amount of tickets in Zoho Desk

Hello Support, 

My tickets got updated by mistake and now my whole system destroyed, the contact on a lot of tickets got updated and assigned a random contact. Here's a video of me explaining: https://www.veed.io/embed/1ea119e8-a34a-475a-829d-4c206d055cbb

I need help asap.