Listed in error

In Jan 2015 I received a letter from Discovery dated Nov 2014 that they were going to list me on ITC for not paying my account when they debit my account monthly. I called in only to be told that the listing was in error and that I would be de - listed. The lady Roche refused to get me a letter from ITC stating I was de - listed. I than spent my own money to get a report done only to discover that I was not de - listed. Not only this I was double debited this month. The manner in which my query was dealt with was beyond insulting. I find this to be totally unacceptable and as a result would like to cancel ALL policies I have with discovery. If I cannot trust them to have my best interests at heart how can I trust them with my investments and life cover.