We kindly ask you to please contact our customer service directly, so that they can check this for you.
https://helpcenter.digitec.ch/hc/de/requests/new
These vouchers, whether purchased at the normal price or in an offer, have no expiry date.
So you can shop at your leisure when the price is lower and wait until the end of January to activate.
There is no "Extra payment" But everyone needs an own abo. These abos then can be combined, so you all have the family & friends discount. If you have any further questions, feel free to contact our customer service. https://helpcenter.digitec.ch/hc/de/requests/new.