Where applicable, the optional service boosters can be purchased at any point in the duration of your service pack. There is no limit to the number of boosters that can be consumed.
All service boosters are a one-time charge and take immediate effect. They will last for the duration of the service pack or until they are exhaused whichever is first. They carry no residual value if a service pack subscription is ceased or expires.
To enable Digital Advertising, advertising credits are needed. As an advertising campaign runs and your advert gets Aired so the amount of credits available to you will reduce. The rate of credit consumption will depend on the campaign created. Some Trackchat service packs include a monthly allowance of credits. These will accumulate each subscription period.