What Promotions are available for an existing customer, I am looking for new plan.

What Promotions are available for an existing customer, I am looking for new plan.

When I click on "change plan" on the website, it tells me "were sorry" and for me to contact customer service. I have spoke to customer service in November, December and January and they said they are working on fixing it, but it still does not work. I want to be able to compare the different packages online and see the cost differences.