Changes not visable in the MijnKPN app

I have 2 subscriptions with Kpn,  last month I changed the contract of mobile nr 06***** toa cheaper offer. Got the confirmation on the mobile app the changes will be applicable from this new month October. But when I check the app today, seems nothing has been changed. Is this normal? Or can you let me know when the changes will start reflecting on the app? 

admin: Made a new topic for your question