Contacts that were imported and not linking with the already existing companies (I made a huge mistake)!

Hello! I imported a ton of contacts and clicked the box “Create a corresponding Company Record for everyone with a company”. I didn’t realize the effect. Essentially none of the contact linked and synced with the already existing companies. Do I now have to go and update each contact one by one or is there an easier way to fix this? When I go into the contact records, there are 2 fields labeled “Company” listed, one with the actual company name and the other box says “Choose a company”. Also, when I go look at the company record and navigate to contacts, the newly imported contacts are not listed. PLEASE HELP!!!