Ebucks Complaint not Resolved by FNB ebucks

I am beyond frustrated with FNB and their customer service is probably one of the worst in the banking industry.Have been busy with the same frustration for over 2 weeks ,spoke and chatted to over 10 Agents most of them really not keen on assisting , A simple matter such a sorting my ebucks backdating which emanates from incorrect status profiling. On 4 and 5 May i received calls from ebucks agents advosing that the matter has been resolved and my ebucks will be back dated with 5days which hasnt happened Today i chat to agent at ebucks named Mamello she was very unwilling to assist and argued with me .Wants to treat the matter as new as she refuses to investigate even wen i told her i was contacted by agents from ebucks on 4th and 5th May to advise that the issue has been resolved. Mamello dismissed this insinuating that i'm lying as she cant records of calls ,she called me back and spoke over me raising her voice at me like im a child. No matter how much i requested her to investigate properly as i informed her that i was contacted by ebucks Agents she insisted. She then put me on hold for a while and when she came back and pretended not to hear if when i kept responding ,she hung up the call. i was contacted on the 4th from a *** at 13:22 ,again from *** at 14:20 Contacted again from *** @13:02 and again 14:55 from *** i provide all this information to Mamello however she kept insisting that she finds no record of calls from ebucks to me. i am frustrated as the horrible service by FNB for such a simple matter that shouldnt require weeks of back and forth. What should i do go get this matter resolve with FNB ,