ABSA Insurance and Homeloans Silo-fication and inability to communicate with departments and customers

I am so disappointed in ABSA's HOC (building insurance) and Homeloans. I have been with them for over 20 years and I think there has been a change in the system. Not only did they initially way overcharge me, they made blatant errors on my policy (for example stating that the property had no geysers). After much back and forth, I agreed to a policy that suited my insurance needs. This was confirmed in September. Imagine my surprise when I see my monthly Homeloan statement breakdown (my bond is with ABSA as well) and they are charging DOUBLE what it should be according to the new insurance policy. After being shifted from Home Loans to Insurance with neither department taking responsibility and countless dropped calls from Insurance, I still have not received a response. I am owed over R1600 for overcharging. I think it is time for me to move to another insurer. These are some of the case numbers I have been given but no one has followed up on: C***3, C***0, C***5