Change debit order

Still no response since the 5th of August 2015.<br> <br> I am flabbergasted that a simple request to change a debit order date is so difficult to perform at Mercedes Benz due to your inefficient IT systems. Your after sale service is absolutely pathetic and a lot to be desired! I contacted the service centre who advised that a debit order date can only be done once every 6 months and advised that I should speak to the collections department. Spoke to the collections department, they said that they also cannot assist, I need to speak to the collection manager. <br> <br> I am in the process of changing jobs and need by debit order to be changed from the 25th of every month to the last day of every month.<br> <br> Could this request please be actioned ASAP and confirm once done!<br> <br> Kind regards<br> Angelique Reeby<br>