Not everyone will be cured first time. However, we believe if Ruqyah is done competently then inshallah with the permission of Allah you should be cured. As you know treating an illness consists of 2 parts, diagnosis and treatment. It may be in some cases that either of these components is lacking. It may be that the initial diagnosis may not have been entirely correct, therefore leading a person to actions that did not deliver a cure. Or it may simply be the treatment needs to be adjusted. It is also worth noting in certain cases the patient maybe doing things contrary to the treatment.