POOR SERVICE ACCOUNTS DEPARTMENT

Totally annoyed and frustrated with Edgars accounts department. I mistakenly paid money into the wrong account. Payment was made via eft. Luckily the account was my brother's. which had no outstanding balance. I called Edgars and after going back and forth i was eventually told that they need proof of payment and a copy of my id. i promptly sent these documents. i was then told that the matter would be resolved within 7 to 14 working days and this was more than a month ago. i have sent follow up emails since then and received no reply. I received my edgars statement and the amount is still not reflecting on my statement despite several follow up emails. Today i have tried several times to call the number number provided and after asking me to put in my id number cuts off. Im really at my wits end as this was not a small amount of money that was paid. I want this resolved urgently but honestly not sure what im supposed to do.