Debit order details not changed

I called in on the 12th of October to change my debit order account details I spoke to Mfihlako Kubheka who assured me my debit order will go off my new account. The debit order did not go off my new account it went off my old account and returned causing me to pay unpaid fees. I then called in again to advise that the funds did not go off and for discovery to debit me on the correct account and return the unpaid fees as this was no error of mine, I spoke to Sandile Ngobeni who said he will get back to me and never did. For such a reputable company to make such promises and not delivery is unacceptable and totally appalling! I am unhappy with the way ive been treated and to think I was going to join their medical aid scheme and home owners cover, but due to no one assisting me I have to now type on hello peter to share my disappointment and frustration at Discovery Insurnace