Data inputted by the user when the if -statement (match == true) is executed is not stored

 public void addProduct (Vector <Stock> temp){
    Scanner sc = new Scanner (System.in);
    sc.useDelimiter("\n");

    String name = "";
    String qty = "";
    String cost = "";
    String qt = "";
    String cos = "";
    int qy = 0;
    int cs = 0;
    int q = 0;
    int c = 0;
    boolean v;
    boolean match = false;
    boolean added = false;
    Stock st = null;

    do{
        System.out.println("Enter Product Name: ");
        name = sc.next();
        if((name.matches(valn)) && (temp.size() == 0)){
            v = true;
            do{
                try{
                    System.out.println("Enter Quantity: ");
                    q = sc.nextInt();
                    System.out.println("Enter Cost: ");
                    c = sc.nextInt();
                    v = false;
                }catch(InputMismatchException ie){
                    sc.next();
                    System.out.println ("Invalid Entry!");
                }
            }while(v);
            qty = Integer.toString(q);
            cost = Integer.toString(c);
            Stock s1 = new Stock(name, qty, cost);
            temp.add(s1);
            added = true;
            System.out.println ("Product was Added Succesfully!");
            System.out.println ();
        }else if((name.matches(valn)) && (temp.size() > 0)){
            int l = 0;
            for(int i = 0; i < temp.size(); i ++){
                st = temp.elementAt(i);
                if(name.equalsIgnoreCase(st.getName())){
                    l = i;
                    match = true;
                }
            }
            if(match == true){
                System.out.println ("Product Already Exists."); 
                System.out.println ("Note: Product will be Overwritten!");
                System.out.println ();
                v = true;
                do{
                    try{
                        System.out.println("Enter Quantity: ");
                        qy = sc.nextInt();
                        System.out.println("Enter Cost: ");
                        cs = sc.nextInt();
                        v = false;
                    }catch(InputMismatchException ie){
                        sc.next();
                        System.out.println ("Invalid Entry! Please Try Again.");
                    }
                }while(v);
                if((qty.matches(valq)) && (cost.matches(valc))){
                    qt = Integer.toString(qy);
                    cos = Integer.toString(cs);
                }
                temp.elementAt(l).setQuantity(qt);
                temp.elementAt(l).setCost(cos);
                added = true;
                System.out.println ("Product Overwritten Successfully!");
            }else if (match != true){
                v = true;
                do{
                    try{
                        System.out.println("Enter Quantity: ");
                        q = sc.nextInt();
                        System.out.println("Enter Cost: ");
                        c = sc.nextInt();
                        v = false;
                    }catch(InputMismatchException ie){
                        sc.next();
                        System.out.println ("Invalid Entry! Please Try Again.");
                    }
                }while(v);
                qty = Integer.toString(q);
                cost = Integer.toString(c);
                Stock s1 = new Stock(name, qty, cost);
                temp.add(s1);
                added = true;
                System.out.println ("Product was Added Succesfully!");
                System.out.println ();
            }
        }else
            System.out.println ("Invalid Name Input!");
    }while(added != true);
}

When I am testing the program regardin entering a product name which is already stored, i.e match == true if statement, everything works perfectly fine, but the quantity and cost are not saved. What could be the issue please?