Bad service

On the 30th I made a purchase of 999.08 and I accidently punched the incorrect amount on my app for R2209.00. As a results this triggered three installments of 736.34 which the first installment was deducted in my account. Leaving me with two next installment of the same amount. I then realised the mistake and alerted Edgar's which I returned the goods back to cancel the mistake. When I informed pay just now they also advise that I should return the goods which I did. I was expecting the first installment deducted in my account will be returned by pay just now which they didn't do that despite me returning the goods. Edgar's also sent email to them informing them the goods were returned and I would need to be refunded in my account with the 736.34 they deducted and cancel the deal on the app as it still showed that 2209.02 was deducted in their app. they are not responding to the email sent by Edgar's. This is unfair treatment as their customer.