No service for valuables and compensation after a Swiss Air Flight from Paris to Johannesburg.

I was flying from Paris (22 June 2025) on flight LX0645 with booking code YAA7NU to Zurich and then within and hour flying to Oliver Thambo in Johannesburg. Departure was 19:35, but was delayed for an hour and half. While waiting the lady at the counter told me to check in my hand luggage as there were not enough storage space. I was not happy at all to do that, as I told her it is not locked and I intended to keep it with me at all times - all my valuable jewelry as well as my Ray Ban sunglasses and Reading glasses were in there. She took my bag and said it will be fine. When I arrived home in Johannesburg, I found that literally all my jewelry (Mabé pearl earrings and necklace) ; Swarovsky Neclace and all other with them were ******, as well as the glasses. I have send an email to Swiss Air and Florence Ofati Consultant for Customer Feedback Services / R1S have send the following reply: (Although I realize the inconvenience you had, I count on your understanding that I am unable to give you a different answer). I am certainly not happy with Swiss Air: I was forced to check in my hand luggage, although I said it was not locked and do not feel comfortable to check it in. I have flown a few times with Swiss Air and always said their service and food on the plane are outstanding - but this leaves me with a sour feeling, as this was jewelry I bought back in 1980 and cannot replace them!!