Worst customer service ever

On Thursday the 10th of June 2022 I received a call from Netstar,and the consultant was Mbali. She advised that my contract was coming to term, and i had to renew it. I agreed and i was sent a new contract via email. She said she had booked for someone to come and install a new unit in my car on Friday 11 June 2022 @ 11am. Till today im still waiting for the person to come through and on the tracker that is in my car now doesnt work anymore. On the 25th im expected to pay for something that is not installed? I called several times and i was told someone is going to call no has called.im so annoyed of this can someone just fix this nonsense.