hi, I order all my pool chemicals from you. I recently ordered the wrong product In error. I called you, you replaced the wrong product with the right one. you charged me £9.99 for doing that. I was surprized by the charge, given I buy all my chemicals from you. under distance selling rules I could have just returned the item to you and ordered separately. I didn't, I was honest with you. I know its a cost to you, but I thought customers making honest mistakes would be supported. the difference in price of the items should have resulted in a refund to me, the invoice I have been sent doesn't show any balance? the returned parcel included my free gift, the replacement didn't have my free gift? I wasn't told to keep it from the 1st parcel.