Hi ​@hhan Welcome to our Community! I completely understand that this raises questions, which is why I would like to look at your invoice with you! 

First of all, thank you for your payment! Is it a mobile or Internet subscription? When I take a look at the phone number in your profile, I don't get any data on this in our system. The customer number does. Could you put the correct phone number in your profile and give me a sign when you have done this? Then I can check with you! 

Can you also give some more information about the amount you saw on your invoice and what you paid? Then I can take a look at this as well!