SWISS Air customer service - non existent

Terrible customer service and system errors on the booking portal.

I booked a flight, and when changing from economy lite to standard economy, the system had changed my departure date.

Contacted the airline and asked for assistance, and despite it being a system error, they refused to provide any help in sorting the matter and insisted that the only way it could change is if I paid for a flight change for a ridiculous amount of money.

On top of it, the return layover is 12h, and upon asking what the options are to occupy your time with the long layover, nothing is provided.

Not an exit, not a meal, no customer service at all.

Each request was met with a hard no and zero urgency to see to basic customer support, immediately regret the decision to have booked a flight with them.