FNB not responding to emails or resolving issue

Funds were paid into my account by mistake from a Company. We requested that a refund be made by FNB. Fnb requested more info that was provided by the company and since then we have not received any feedback even after sending many emails to 4 different people at FNB with the names Jackie Maseko, Pinky Seabi, Hira Suveer & Zelda Johnson. The first email was send in early January and the issue is still not resolved.