Unfair treatment

Good morning, I phoned Fidelity and request them to install a tracker on my car, on the 11 November 2024 and they came and installed it, on Saturday 23 November 2024 the car couldn't start and it shows on their app that the engine has been disabled, I phoned them to come and assist and no one came to assist, I have been phoning everyday more that 5 times a day and no one is willing to assist, they tell me someone will call me and no one is phoning me, today is Friday and I cannot use the car. I am using the car for business, and I lost income for the whole week as no one is willing to assist me, I am so frustrated, and I don't know what to do anymore. please assist because i feel it is unprofessional and unfair the way Fidelity is treating me. I feel they must also pay me the money I should have made this week. They operate like they don't even know what they are doing.