Discovery Health Medical Aid Issues

I got a quote via Hippo for Medical Aid. Discovery was one of the best options for my needs, so I decided to go for the Delta Saver option. After consideration, I phoned to change the option from Delta Saver to Keycare Plus. I filled in all the relevant documentation needed and submitted it via email. The Discovery team was very helpful and fast in a helpful manner to assist me and I recieved my certificate of membership within a few days, which stated my premium, option and dependants. My debit order came back returned, because they did not debit the right amount. Not only does this reflect badly on my credit profile, but I am responsible for the banking fees of a unpaid/returned debit order. I would appreciate Discovery Health's prompt feedback.

Kind Regards Ernst Piater