According to Billing Provider's Guide:
To return regular fees in the current subscription, you need to renew the subscription without a promotion, that is to leave the Promotion Code field empty, or just switch the period.
However when the subscription had been renewed, promotion was not removed.
Applicable To Renewal option is enabled for the Promotion in
Home > Products > Marketing,
General tab of the Promotion.
To remove promotion from the subscription perform the steps below:
- Go to Home > Products > Marketing;
- Find the Promotion applied to a subscription;
- Click Edit;
Applicable To Renewaloption;
- Renew the Subscription without Promo Code;
- Revert changes back to the Promotion if it is required.