XP Plumbers

XP has had me waiting around my flat for their electrician for two full days. I feel like I am in a prosaic production of Waiting for Godot. Note: though their address is in Kent, they service London.
Gory details: On Friday they asked if I would be home that day. I said yes and rearranged my schedule so I could be there, since I wanted to get my lights back on ASAP. They said they would get someone out that day and would call me back with the details. Several hours later they called back saying it wouldn’t be happening that day and they would be there Monday between 9 and 11. At this point, I would have just called another company but I am locked into XP through my property management company.
On Monday I got a call at 10am saying that the electrician would be there in 30 minutes. A few hours later, when he or she had not arrived, I called back. My call went directly to voicemail. I left a message. The hours ticked by. I tried calling again a few times — nothing. Finally, I got my property manager to try calling and magically they actually picked up for him. They told him that they would be at my flat «at some point» that day. It was after 6pm by the time they actually arrived. They had brought the wrong equipment… So, the wait for lighting continues.