Hi, I currently have Magenta XL flex tariff with 3 PlusKarten. 2 of those PlusKarten are for my kids, both are under 18. However, it appears that they were set up as normal PlusKarten initially as the price used to be the same. I would like to change these to the newest tariffs where there is a price difference between normal and teen/kids PlusKarten. 

I went to the store and they said they can only cancel it and start new ones with completely different phone numbers. I chatted with Telekom support who told it can be done over the phone Hotline. I called but they said they cannot do it either. 

I did see in the community support that someone else has that successfully changed, though. 

I would appreciate it if someone could help with changing the cards to PlusKarte Teen without completely changing the phone numbers. 

Thank you!