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magento setCustomPrice , setOriginalCustomPrice not updating correctly while adding product

I’ve discount product in my system, instead of adding discount product from system i need to add product from json response. I’m running in loop that adding product and price update. It’s working with 2 set of data but not working single data. this is my code.

    foreach ($key['container] as $sku) {
        $loadProduct = $this->getModel('catalog/product')            
                ->loadByAttribute('sku', $sku);
        $addedItem = $cart->addProduct($loadProduct->getId());
        if (!is_string($addedItem)) {       
            $addedItem->getProduct()->setIsSuperMode(true); 
            $addedItem->setCustomPrice($price);
            $addedItem->setOriginalCustomPrice($price);
            $addedItem->save();
        }
    }
}

$cart->save();

The issue I’ve defined a product ABC has -10 price in my system but i need to change this as -15 for ABC. If the price is 0.00 in system it’s updating but if i override > 0 price it’s not updating.