This can have several reasons. It could be that you mixed up the digits in a hurry or by mistake. Therefore, first go through all the possible code combinations and test whether the case can be opened after all (caution: push the lock slider to the side or slide it!). If you have not yet stored a personal code combination in your suitcase lock, the factory setting is: 0-0-0.
Our tip: Number combinations like 8-6-9 can also be read like 6-9-8, depending on which side your travelite case is currently lying on - keep this in mind when setting the number wheels.
If none of these tips work, the lock may have been damaged during travel.
In this case, please contact the retailer where you purchased the suitcase directly or report the damage to the carrier.