Extremely Poor service from Old Mutual

I sent a complaint to old mutual on the 26th April 2019, and have had no response to date. Only that they have received the complaint and shall revert back. My complaint was:I have had no response from you or your company since Fri 2018/11/30 10:28 AM (attached) , now I hear that my account has been handed over for and outstanding amount of over R3800. I will not pay this , I will pay you what was outstanding and I demand a paid up letter. I will not make arrangement with attorneys as I have kept my payment arrangement and have heard nothing from you since. My last payment I made was for R2200. And that was sufficient for all the months I did not pay afterwards.