Bad service

For a 1st time client that wanted to install 2 cars with the tracking device but the service I received today from the scheduling department was very appalling honestly I dont know if I really want to still continue because how can I trust going forward,I spoke to a lady from scheduling department and asked her to schedule after 12 because I'm not home and if I can request a specific technician that I received compliments about,she agreed to all that and even mentioned that all calls are recorded,5mins later I receive a sms for schedule at 10:10am and a different technician,I call back furious and speak to Nthuthuko using my airtime for 20mins to rectify this because I'm not at home during 10...I stay on the line while his calling the technician,he comes back and says I had to persuade the technician to change the time...like they doing me a favour,I ask for the lady's name because obviously he can see who was last on my profile so I can write this bad review to her but he didnt give the information,she just agreed to everything as if shes chasing a sale,I'm very unhappy...when the technician comes il cancel it Thank you