Hi,
It would be more helpful if you could clarify and elaborate a little more on your problem.
As a general statement, for a wireless router to work with an ISP it must have the correct requirements such as the ability to use PPPoE, Annex A and so on. The data plan could affect in such manner: The wireless router is capable of reading up to 10Mbps and you are receiving 20Mbps. This doesnt affect the functionality but the speed you will be loosing due to the router.
I think this problem should be discussed with your ISP as they would be more informative on their data plan and their system.
Regards,
Brandon