I got good resolution:
I wrote:
I ordered this product as a pack of 12, but you shipped only one. When I placed my order, the website indicated pack of 12. I do not think I should have to pay the return shipping cost, nor is it appropriate for you to charge me a 15% restocking fee.
They responded:
Hello,
Thank you for your message,
Your order was fulfilled incorrectly due to a listing error. Listing errors can occur when a listing is adjusted by a different marketplace seller.
Unfortunately we are unable to send you additional items. We have issued a proportional refund of $ 3.90
Again, we truly apologize for this inconvenience and hope you will give us a chance to redeem ourselves in the future.
Please take 5% off your next purchase Pharmapacks order using code PHARMAP5 at check out.
Thank you,
Pharmapacks Customer Care