Poor Customer Service from Discovery Insure

My car and household insurance was insured by Discovery Insure. Up until end April 2015, I was satisfied with the service levels provided, until the end of May 2015, Discovery Insure decided to make a double deduction on my account. When I contacted the call centre and spoke to a Mr Clerence Molatelo, I was horrified to find out that they had made a mistake and decided to make a double deduction off my bank account. As you can imagine this is a substantial amount and I was devastated to hear that they had done this without warning or consent from myself. Their excuse was that they had failed to take a deduction the previous month. Whilst this is understandable, it is by no means acceptable behavior. Surely, a courtesy notification, advising me that there had been a problem and that as a result a double deduction would be made at the end of the month. This was never done and the attitude and service received from Discovery Insure made me choose to cancel my policy with immediate effect. I tried to contact Discovery Insure and spoke with a Mr Ricardo da Silva, Assistant Financial Adviser, who provided me with a new quotation. Despite my complaint to him, I did not get an answer.