Complaining is pointless when nothing is done

I submitted a complaint regarding a request I had sent through to FNB for my proof of payment and to date it hasn’t been resolved. How does a simple request take almost a month to get resolved? I’ve sent numerous emails regarding complaint reference ***NF to their hello Peter complaints team and nothing has been done! How am I being called and told I’d be sent documentation and a dispute claim will be lodged on my behalf only for this not to happen. Someone is honestly not handling this matter as they need or with high priority. I was told there’s a backlog but surely it can’t be one that takes almost a month. I’ve been given an SLA for my matter but it’s still ongoing! Why am I being **** to repeatedly???? Is this how you treat your customers and are not bothered by them being part of the client base? Am I just a number because I’m really not impressed by the service I am receiving