The charging cable from Braun has the item number 81741500. Available here at Galaxus: Braun spare part - plug-in power supply with cable - black

I have two original cable network devices (still in OVP) for sale privately. Who needs one?

This is a question Digitec must answer. I find it disturbing that Digitec pass on questions to customers that are their business as sellers. Selling is more than just collecting money and charging small quantity surcharges. Selling without customer service has short legs ...

Unfortunately, I can't answer that. I've never had to buy anything.
Maybe have a look at Melelectronics, Mediamarkt...etc.