Disappointed and very much poor service currently

So disappointed about their service this time around, its track unit is not working but I have been waiting for over a 5 days now to come and replace the unit. I have called in on Thursday & they said they booked the Technician on Friday, called in the afternoon, they re-schedule for over the weekend till Monday latest, called in on Monday, still no Technician coming. This morning called in they still saying the same statement: "You will receive an sms once Technician coming your way" , I had hoped this would be a matter of urgency for them to replace the unit, but that does not apply to them. Will it be my fault if the car gets ****** at the moment?