Arrive late or not at all AFTER rescheduling twice

Verminator has been to my house 3 times, and was due for a 4th visit today. Because they work in my area in the morning only, I had to arrange for someone to be home, as I work during the day. The 1st extermination was in January. When the ant problem remained, I booked them again in March (they have a 4-month guarantee). First they rescheduled the date, then arrived 2 hours too early, when no one was home. On the 3rd visit they said they needed to come back, after which I followed up. I got a booking for today 8:30 am, which came and went. Again I followed up, and was told that my slot got swopped around (without notice) and they would be there at 09:00 am, which also came and went. At 12:00 I phoned again, at which point they told me they would phone their driver. By then he was over 4 hours late. They said he was there at 10:00am, but there was no answer. This was a lie, as my housemate had kept an eye out for them all day. Eventually we asked them to please come before 15:00 because she had to leave at 15:30. So they said the driver was in Table View but would come at 15:15, which is much too late as it takes an hour. Then they rescheduled AGAIN. My problem remains unsolved.