Double billing on accounts

A calendar was sent to my son by Jacklin, I received this calendar on the 9th Jan 2015 and paid the amount into their account on the same day - the money reflected in their account on the 12th January. Yesterday I wanted to withdraw money from my savings accounts and was not able to as Jacklin has debited my account with the same amount on the 30th Jan. THEY ARE *****ING MONEY FROM PEOPLE FOR A SERVICE THAT THEY DON'T EVEN DELIVER. I phoned to ask for money back and was informed that I will have to wait 14 to 21 days for the request to be processed. When I paid the account I did not request for a payment and they had to wait 14 to 21 days, I paid immediately