Poor Customer Service/Not Correct Effecting User Customer Requests

My company is making me the fall guy due to QuickSure's incompetence. I am responsible for managing my employer's mobile portfolio which includes staff's mobile phones. Often I request QuickSure to register new devices IMEI numbers, for Insurance purposes. On a number of occasions, QuickSure makes mistakes which I have to follow up on, to ensure that devices indeed are insured. My Company is now making a meal of the fact that I corrected QuickSure's error. I have requested QuickSure to confirm that this does not amount to an illegitimate act, and they are proving to be rather non-responsive.