The recommendation would be to simply complain to the customer service if the worst comes to the worst. The additional tip for this monitor would be for an appropriate replacement cable and not for an adapter which is impractical.
Print out the following and hang it on the fridge as a reminder for the future.

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Digitec (or any other Swiss retailer) is obliged to supply electrical appliances with a Swiss plug. If the appliance is supplied with a foreign plug, a suitable replacement cable should be supplied if the mains cable is pluggable or alternatively if the mains cable is permanently connected, a suitable adapter should be supplied.

If the appliance is delivered without a suitable plug, complain to the customer service and insist on a cable or an adapter, free of charge.

Info Digitec --> https://helpcenter.digitec.ch/hc...
Point 1 --> https://www.esti.admin.ch/de...