Most promotions are for a new line of service, they are introductory offers to get you invited into the service to see if you would like to pay for the service on a regular basis. If you have any way to upgrade an additional or existing service there may be promotions available to you for a lower cost.
You can PM your phone# or account# and I can check into this for you.
To PM or Personal Message please click the talk bubble below my name on the left. It should be to the right of the email icon.