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Hello @Abdulla CM, @bollydow, @Lorem Ipsum, @IronMan0803  I have similar problem but I try like code bellow:

Cache::clear();
$specific_price->flushCache();
Tools::generateIndex();
DB::getInstance()->execute('RESET QUERY CACHE;');
DB::getInstance()->execute('FLUSH QUERY CACHE;');
$cart->resetStaticCache();
$cart->update();

of course without the success 

Hello all  I have similar problem but I try like code bellow:

Cache::clear();
$specific_price->flushCache();
Tools::generateIndex();
DB::getInstance()->execute('RESET QUERY CACHE;');
DB::getInstance()->execute('FLUSH QUERY CACHE;');
$cart->resetStaticCache();
$cart->update();

of course without the success