diff --git a/src/main/java/com/dino/scrum/sysmag/model/Product.java b/src/main/java/com/dino/scrum/sysmag/model/Product.java
index d67df37..ba9b301 100644
--- a/src/main/java/com/dino/scrum/sysmag/model/Product.java
+++ b/src/main/java/com/dino/scrum/sysmag/model/Product.java
@@ -52,7 +52,9 @@ public class Product {
     private String imageLink;
 
     public Product setChangeQuantity(long change) {
+        System.out.println("IN MODEL quantity: " + this.getQuantity() + " change" + change);
         this.quantity += change;
+        System.out.println("IN MODEL after change quantity: " + this.getQuantity());
         return this;
     }
 
diff --git a/src/main/java/com/dino/scrum/sysmag/service/ProductServiceImpl.java b/src/main/java/com/dino/scrum/sysmag/service/ProductServiceImpl.java
index d03533f..906b643 100644
--- a/src/main/java/com/dino/scrum/sysmag/service/ProductServiceImpl.java
+++ b/src/main/java/com/dino/scrum/sysmag/service/ProductServiceImpl.java
@@ -43,7 +43,12 @@ public class ProductServiceImpl implements ProductService {
     @Override
     public Product changeQuantity(QuantityChange quantityChange) throws Exception {
         productValidator.checkIfExists(quantityChange.getId());
-        return productRepository.findById(quantityChange.getId()).setChangeQuantity(quantityChange.getChange());
+        System.out.println("id: " + quantityChange.getId() + " change: " + quantityChange.getChange());
+
+        Product product = productRepository.findById(quantityChange.getId());
+        product.setChangeQuantity(quantityChange.getChange());
+        productRepository.save(product);
+        return productRepository.findById(quantityChange.getId());
     }
 
     @Override
diff --git a/src/main/java/com/dino/scrum/sysmag/validator/ProductValidator.java b/src/main/java/com/dino/scrum/sysmag/validator/ProductValidator.java
index 62a80ac..dd6dcac 100644
--- a/src/main/java/com/dino/scrum/sysmag/validator/ProductValidator.java
+++ b/src/main/java/com/dino/scrum/sysmag/validator/ProductValidator.java
@@ -29,6 +29,7 @@ public class ProductValidator {
     public void checkIfExists(long id) throws Exception {
         if (!existsById(id))
             throw new Exception("Product with id: " + id + " not found");
+        System.out.println(id + " exists");
     }
 
     public void checkIfExists(String name) throws Exception {