Arbeitlosenkasse Employee rude and giving fake name

Hello, is there a way to get a supervisor investigate an employee at the Zürich Arbeitlosenkasse ?
I had today another call with them after there was an error with the insolvenz payment, and the old woman that answered was rude, unfriendly and since it was not the first time i spoke with her and she was behaving this way i had to record her.

When i asked for her name she told me 5 times a fake surname and then finally the full name which is still fake.

I checked on the website and it's non existent and then i filed a complain via form, which was followed by a phone call by another operator who apologised and did hear to my record, and confirmed the fake name she gave me.

Unfortunately he said that he doesn't know who the employee is, which is unlikely since i told him what time i did the call with her and i am pretty sure they have a log book for the calls ( or they should ) and plus the voice could help recognise her too.

So i would like to escalate this issue in order to not have this employee keep behaving this way and make fun of others.