Unreliable customer service

My tv broke. It is still under guarantee, so I am relying on Hisense to do the repair. Firstly I reported it on an online form provided on their website. I received email confirmation, but after waiting a week, I phoned them. They were unaware of the reported fault, but made an appointment for the following week to attend to the fault. No one however arrived, so I phoned again. The appointment had been cancelled, so a new appointment for a week later has been made. Ridiculously, waiting so many weeks. If I had known, I would have purchased another tv.