Firstly, you must ask the management office and security guards to refuse him entry to you unit.

This is a business dispute and normally police dont entertain such report unless threat of physical harm or damage property.

Hire someone to open the grill and replace a new lock to grill and door to prevent his entry.

Send him a message saying you will hire another contractor to finish the job and not willing to pursue further with him and including seeking compensation.

Replace the locks are urgent as he may gain access and destroy your property.

Finally, I dont think you want him to finish the job.

This post has been edited by mini orchard: May 23 2021, 12:41 PM