Hi @Sourav, our customer care number is 0800-0402 (toll free) but you can also chat with us on www.kpn.com/service 

If you want I can ofcourse take a look as well. What is the issue you're experiencing exactly?
Could you update your profile and let me know? (please include your mobile number and simcardnumber in the “persoonlijke opmerkingen” field)