SIM card not working despite activation

Hi ​@MS87, and welcome to our KPN Community. That's a very unfortunate loop to be stuck in. Odd too, that your connection isn't working despite receiving messages that all is ready. 

Just to check a few things:

• The KPN simcard is placed in your phone? Or the e-sim is showing as active in the settings?
• Have you restarted your phone since this happened? 
• You cannot make calls, to any number? Or one specific number?
• Can you send text messages?

If nothing is working and the steps don't help, then you can also contact us on Facebook or X if you have an account for any of those. Send a private message with the phone number it concerns and, if it's a subscription, your address and the name of the subscriber. Then my colleagues there can take a look. 

If you don't have a Facebook or X account my next suggestion would be to go to one of our KPN stores. My colleague there can check everything with you and hopefully the connection will be working quickly then!