is it about a new contract?

yes both of are new contract and new sim cards.

contact customer service.

Hello ​@ahmetalperkeskin,
i would like to welcome you to our community 
It sounds good that you have signed new contracts with us  Especially in December before the holidays, Deutsche Post can have longer delivery times. Have you received any mail in the meantime or are you still waiting? Have you been able to chat with us and get more information about your contracts?
Best regards

Kathi

Hi,

I have not received sim cards, unfortunately. If you can help me, i would be happy. 

why don't you call?

Because of the fact that my current sim card does not work properly, i could not speak with anyone continuously, when i call someone, i lost communication during phone call. That’s why we need sim cards which work properly. Is there anything to answer to get help ?

then borrow a phone from a friend.