Prepaid contracts as elements of hybrid products offer the provider greater revenue security, however, the stochastic call-off behavior of customers complicates planning the capacity provision and requires a chance-constraint program. As this is usually hard to solve, the scenario approach by Calafiore and Campi could be an option. Hence, we present the corresponding modeling and evaluate it using the example of a product program with prepaid fixed, prepaid free quota, and pay-per-use contracts.