AUGUST INVOICE

I have been wasting my precious time calling MTN for something that it seems like they don't have solution for, a simple invoice. Imagine calling them more than I call my wife. I have been looking for my August invoice which several calls were logged and MTN keep disappointing. I hate to say this, their service is disappointing, who still call a company to ask them for an invoice in 2021? I mean I have been telling their service champion that if it wasn't for the cancelation fee, I would have left them long ago cos they are not offering me solution instead they are giving me problems cos that invoice if needed urgently.