Good day, my package wasn’t delivered and cannot be found on address of drop off. I called postnl several times, they told me that only sender can rise that issue.

As through “magnificent” web site of KPN it is impossible to find a telephone number to call, I feel this is the only way to rise an issue. 

KPN monteur will be already 22nd of July to install it, but I do not received modem.

What shall I do?