If you had legal insurance (assurance juridique) it would be worth call to ask them to send a letter to your provider. Unfortunately most legal insurances do not cover securities and investments litigation...

Otherwise an official complaint letter may help get you back some of your premiums.

Going forwards, best to use 3a accounts with a flexible investment policy that you control (or a financial advisor) to try to benefit from rare market corrections as this we saw this past march. These are usually not offered by banks or insurance companies though... Same with your vested benefits account btw.

3b only provides limited tax benefits in a couple of cantons (GE and FR). Stay away from mixed investments and insurance solutions. The wrappers used are very expensive for clients as you have seen.

For pure life insurance, Switzerland is very pricey, there are international solutions from the major companies that are less than local providers.