No refunds allocated to my edgars account for duplication amounts.

I made an online purchase on 17/08/2018 for R309.90 and one of the agents advised me that the order came through twice. I advised them that this was an error and they need to cancel the one and only make 1 delivery. I received a mail confirming this. When I received my Edgars statement the amount of R309.90 was charged 3 times, leaving me with an extra bill of R619.80. I need this to be sorted as Edgars advised that they did not receive any refunds. Please sort this out!