No Callback At Scheduled Time?

I understand that people are busy but when I specifically schedule my evening so I am available at the scheduled callback time and there is no call, it is quite frustrating.

I had a previous call back scheduled and received a call when I was driving. My understanding is that there would be three more attempts but I never received another call.  Consequently I arranged a second call and am still waiting.  Also, my phone is not blocking numbers.

Our contract ends this weekend with Telus and I am struggling to come up with reason not to go to their competition if this is their idea of "customer service"...