This my cart code it it work good with ProductVariants id perfectly work....but incrementToCart not work

 {
        export const addToCart = (product) => (dispatch, getState) => {
          const cartItems = getState().cart.cartItems.slice();
        
          if (!product.selectedVariant) {
            product.selectedVariant = product.ProductVariants[0];
          }
          const existingProductIndex = cartItems.findIndex(p => p.id === product.id && p.selectedVariant.id === product.selectedVariant.id);
          if (existingProductIndex > -1) {
            cartItems[existingProductIndex].selectedVariant.qty += product.selectedVariant.qty;
            NotificationManager.success("Successfully updated", "", 1500);
          } else {
            cartItems.push({ ...product });
            NotificationManager.success("Successfully added", "", 1500);
          }
          dispatch({
            type: ADD_TO_CART,
            payload: { cartItems },
          });
        
          sessionStorage.setItem("cartItems", JSON.stringify(cartItems));
        };
    
    console.log - this data.....
    id: 9, productId: 4, actualPrice: null, distributorPrice: 480, marginPer: 58
    }

This is my incrementTocar code...here may be problem but I can't find so please help me....

export const incrementToCart = (product) => (dispatch, getState) => {
                  const cartItems = getState().cart.cartItems.slice()
                  const selectProduct = cartItems.find(item => item.id === product.productId)
                
                  const index = cartItems.indexOf(selectProduct)
                  const value = cartItems[index].ProductVariants[0];
                
                  console.log(value)
                  value.qty = value.qty + 1;
                  value.total = value.qty * value.netPrice;
                
                  dispatch({
                    type: INCREASE_QUANTITY,
                    payload: { cartItems },
                  });
                  NotificationManager.success("Successfully qnty updated", "", 1500);
                  sessionStorage.setItem("cartItems", JSON.stringify(cartItems));
                }