Worst customer service and shady dealings at BMW Cedar

Took my car to BMW Cedar to fix the automatic cargo cover. After 3 days they told us they cannot fix because the car tracking unit is on their way and we need to get out tracking company to remove then reinstall as they were not allowed to touch it. When the tracking company got there, they found that BMW had already taken out the tracking unit. Then they tell me after a week that they have ordered the part and will commence with replacing, this is after they told me they had already ordered the unit and was just waiting for the tracking company. Mind you I am the one who kept calling them everyday for update on progress as they were not updating me. Eventually after two weeks of back and forth, i got the car back. When I check the tracking unit, it keeps giving me the wrong location; indicating that that car is still at BMW. Car tracking company tried to reboot the unit and failed. Eventually they sent a technician to my house to look at the unit thinking it might be faulty. When the tracking guy arrived, he could not find the unit anywhere in the car, he also explained that when he arrived at BMW they had already taken out the unit themselves (BMW). Again, endless calls to BMW to find out where the unit was, whole time i am being told they never touched the unit as they are not allowed to. At that time the tracking app is showing that the car is still at BMW and they are not returning my calls. Not forgetting the text messages I am now receiving offering to purchase my car. After endless calls and not getting feedback, I eventually drive to BMW, when I arrived I was told they are in meetings and cannot attend to me, mind you this is now two weeks later. I demanded attention and told them I was not going to leave without the unit cos even the app shows that the car tracking unit is there. Long story short, BMW took out the unit themselves and kept it. Whole time, the tracking unit was in their possession.