Horrible serivces

So my complaint just goes on again. Firstly they accused me for being in arrears, when Tracker did not take of the debit order as told they would do. The They took of the correct installation fee on the 1st of Feb and on the 14th of Feb I'm told I'm in arrears again, and then where told it is a mistake and then today, 17th of Feb I'm told that they cancelled my car and removed it. My question is WHY????? I would now really think twice before entering an agreement with them as it seems they do not know what they are doing.