"Pillar 3a life insurance" stories

Ok, Thank you !

I called and I can cancel the SwissLife 3a Insurance, money on it is loss ofc, but no extra fees.
I made the paper to send.

Now, it is about the broker…
What is the legal way to cancel the brokerage mandate that I had to sign at the beginning (a mandate that was never copied to me).
I cannot find an example of letter to send about the cancellation of an insurance brokerage mandate.

Thank you to anyone that can help !