@Meda53: Listing > Pricing and Availability > Pricing > Discounts > scroll to specific one to 'Edit' particular one and enter '0' to eliminated a discount.
Can't make changes in the Calendar, which simply reflects any settings done with the procedure above. Sometimes a mysterious discount starts up, like the weekly one, to date I can't figure out why, so wise to double check every so often to make sure nothing goofy started on its own.