Payment NOT Allocated

I was originally told when signing up for my Cotton On Account that payments can be made at multiple stores. This was false. After making an EFT payment, payment was not allocated, my account has incurred charges and I am assuming my credit record affected. I have made multiple attempts to rectify this! I have sent through proof of payment multiple times, yet this payment is still not allocated! I was contacted rudely for payment, which has been made!! And then told this will be resolved, which it has not been as I can see from my most recent statement! I am being pushed closer and closer to closing my account...