FNB investigation unit poor service

I am so disappointed, I logged a ***** case 2 months ago and still have not received an outcome, and when I try to phone the lines are not available. When I email the investigator that was assigned my case no response is received I have signed documentation they needed and have been patient but 2 months going on 3 is just unacceptable for one to wait, I cannot think that it takes this long to resolve an issue.