Life insurance policies I cashed in

I cashed in 3 life insurance policies that I had paid for 34 years. The insurance company sent me a 1099-R form indicating that the code wasD-7(annuity). They said the money I received was fully taxable. I have tried to contact them and they have not returned my calls. I feel that I should be able to deduct the premiums I paid for 34 years from the proceeds I received . Is there a form I can fill out showing the premiums I paid and the money I received and subtract that amount from the proceeds?

Thanks for any help you can give me. Also how can i prove that the insurance company made a mistake on the 1099-R form when they won't call me back.