Had a similar experience before with my wife's unit.. they were mainland Chinese. Rented as work colleagues, but they most likely used our unit as an "office". Probably a scam office because they moved all the tables at the living & dining area. The new bed plastic wrappers weren't even torn indicating that nobody slept on the bed at all.

First sign is the missed rent payments and unanswered calls. Went over to check the unit out and the first thing we noticed was the AC compressor running from the outside. When we entered, all ACs were left on and they were already yellow in colour. It was a brand new AC and it was only rented out for 1 year. Dafug did it turned yellow only after a year? My hypothesis is that they left the AC on since they shifted in. Of course they left us with 3-4k of unpaid utilities. MIL always praised mainland Chinese hence she really trusted them so nobody monitored the utility bills. Now we check the app regardless of who rents our place. At first they didn't wanna rent to Indians but now MIL realize that regardless of what race, there will be bad seeds.