Standard Bank always a bad experience

Good day. I am in the process of working on my insurance. I cancelled my car insurance and moved within 5 minutes (all done telephonically). then moved on to Standard Bank (hoping that for once I could get good services without issues unlike all previous encounters with this hateful bank). My home was was valued by Standard Bank end of last year at R1.6 million. After several attemps I got throught to the right department at SB to cancell my home owners insurance and was told I must cancell in writing (the only place requesting this anymore) and then provide proof of new insurance to cover my building as according to SB is worth R2 7 million!! I told SB this is impossible but they insisted this what they have on their system (somebody must have entered this amount surely??) and they cannot tell where they got this only that my new policy must cover building for R2.7 million plus other elements they provided. I was also told that they can't assist unless I provide proof of new cover for this amount. this is unacceptable. I never experience any difficulty at any other organisations I deal with except Standard Bank 100 times out of 100 times!!