"Impossible to get an appointment "

I have been trying to get an appointment with a Dr on and off for months. Eventually I give up and then I try again but it is impossible to get an appointment with a Dr at this surgery. All appointments are taken at 0800, which seems to be a "service" run on pot luck. I was invited to book an appointment online and was offered 2 slots in 2 weeks time but they were both taken by the time I tried to book which was within 20 minutes of receiving the invite. I rang the surgery and luckily, was not greeted by the usual rude and uncaring receptionist. I was offered an out of hours appointment at another surgery, (never been offered that before), I received a text message confirming my appointment. I was genuinely delighted. I left work in Birmingham half way through a 12 hour shift on Saturday to attend this appointment, only to find out that it had not been booked. I give up. I have raised my concerns with this surgery before and nothing changes. This practice is dangerous and is putting my health at risk. I have not got the time or the energy to take my concerns to the CQC. I strongly suggest that this surgery does not take on new patients because they cannot look after the patients they have. I have changed my GP today, they cannot possibly be worse.