Not accepting my payment made in Edgars Kollonade.

I paid my edgars account in August in the edgars kolonade store by swiping. They did not take the payment into account. They told me to send them proof. I sent the info that shows edgars kolonade on my bank statement. They won't accept it and not willing to do anything on their side. Now I'm charged interest for a balance which should be less than what they claim

What do they want me to do? Go through the books of edgars and look for my payment?