Unsatisfactory installation

On the 07/02/2021 a tracking unit was installed in my car with a panic button, on Monday I tested the unites by pressing the panic button no call received from the company to check if I was OK. Tuesday I received a call from a call centre agent after I had called the company to complain about the unit the agent said she will call back till today no call has been recieved. I'm really disappointed in this as I now have to pay for a unit that isn't working and also I'm unable to download the tracking app