Complain to your ISP ! Although in some cases the technology used to connect you to their network prevents the usage of IPv6, most of the time it's possible. After all, it's their job to provide you with internet access. These days, an internet access without IPv6 is incomplete.
Please note that some browsers and networks have issues with our testing method. If the output of the test was "false", but you are sure you have native IPv6, please let us know at noc(at)microserum.net