Poor communication and excessive billing due to inflated home valuation

Very difficuly to deal with. They dont respond to emails. Calling in is a total waste of time. Long confirmation process and nothing gets done. 1. I am awaiting confirmation of my dual insurance refund. No feedback provided. 2. Standard bank inflated my house value. I have been paying an extremely high premium due to this. An assessor went out 6 Oct. Once again no feedback from standard bank. I demand my monly premiums be reduced and I also demand a refund for the excessive over billing over the last 13 years.