Defective product 2 months of use

I WILL THE RECOMMENDED since this broke down after 2 months (after 3 or 4 uses barely) I returned the item to the seller at my expense. The seller told refunded the purchase price so today, if I want to buy a similar product, I no longer have the original budget since I have to deduct the cost of return which cost me 7.40 . So waste of time and money. Very disappointed with the seller Zoombits. I had hoped that the seller sent me at least an equivalent key to the amount of return costs as a commercial gesture.