Purchase of clothing from a reputable clothing manufacturer

I would like to complain about Edgars purchasing, i purchased an item on the 7 Aug and received a statement on the 12 Aug charging me for my purchase with account protection plan and service plan which i have asked on numerous occasions must be cancel. Previously there was a 6 months interest free usage on their accounts. I called to ask them if it could be cancelled as i had planned to pay my account and was told NO if you use the account you pay. My question is, why am i being charged if i purchased after the beginning and not yet the end of the month for statements to be run? This is a load on nonsense!!! Very unhappy customer!!!! I placed the call at 13h00 and only finished with the customer service department at 13:27 and was put on long hold numerous times. Customer service sucks!