Dispute over strata plumber bill.

Hi, I am new to this site, please bear with me. Our dishwasher had a leak from the hose which traveled to next doors hallway. They called the strata plumber to investigate leak, at 10pm on a public holiday. Plumber requested access to our unit, believing leak may be from kitchen. He identified leak may be from dishwasher and advised not to use and to get a repair by appliance technician.

Almost two weeks later, we have received the invoice from the strata for this call out. My question is, are we responsible for this invoice? We did not call the plumber and no repairs were carried out. We only provided assistance by allowing access to our unit at 11pm. Your help in this matter would be greatly appreciated.