urgent help

hello,
i m using woocommerce, and i have two question
1st is, add to cart only work when i add the price of a product and due to some reason we don’t want to disclose the price , is there other way we can use the cart function without mentioning the price.
2nd is, if i add one product to cart and after that whenever i refresh the page, the cart gets updated automatically, suppose if i added the product whose price is $100 , and refresh the page now cart has 2 product and the price is $200 and so on, i don’t know whats went wrong please help to resolve that problem
Thank you