If https://www.toppreise.ch/prod_54286... is to be believed, the problem is ultimately Sennheiser and not one of the following distributors. Nobody sells them in Switzerland yet, because Sennheiser has not yet supplied Switzerland. You can leave your order with Digitec, because others are not faster either ;)

The supplier can't seem to deliver them. You can write an email to Digitec (digitec@digitec.ch) to find out more about the delivery date.

I hope I was able to answer your question. If so, please accept my answer as an answer to your question.