Hi @Billy Yang, usually you can still call our customer service (0800-0402) when you have been closed off. My colleagues can look into it and give you more detailed information. But I cannot see there were high costs made. Is this e-mail sent from an @ kpn.com e-mail adress? If not, it might be phishing. 

Thanks for your checking.

i do not want to call for my time consuming.

so i will ignore it. Thanks !

noticed from @kpn.com

If it's from @ kpn.com, then it is legit. But i am still not sure what it is about. If you don't want to call us, that's fine of course. But it's possible that you cannot use your calls/data/text, because apparently we blocked it. If there is an issue, please do try to call our costumerservice.