public function cancelDeal(Deal $deal)
    {
        $cancellation_fee = Helpers::getSetting('fees');
        $service_fee = Helpers::getSetting('service_charge');
        $user_id = auth()->id();
        $buyer_id = $deal->buyer_id;
        $seller_id = $deal->post->user_id;

        $deposit = $deal->post->require_deposit;
        $subTotal = $deal->price*$deal->qty;
        $serviceCharge = (100-$service_fee)/100;
        $seller_total_earn = $subTotal*$serviceCharge;

        // update available qty post
        $deal->post()->increment('available_qty',$deal->qty);

        // update amount left
        $deal->update([
            'release_payment' => NULL,
            'status' => 'Cancelled Deal',
            'amount_left' => 0.00
        ]);