Disgusting, and shocking Service - Refund not received

I sent an email and cancellation letter for my Discovery home and car insurance to be cancelled early June, and clearly specified on the email that no further debits should be permitted from my account for July. I even have a broker, AD Khan, and all correspondence was forwarded to him. But the payment did go through my account as well as the payment for the new insurer. Mr Khan also confirmed that my refund was done on Wednesday and still no payment received. I just called the Discovery call centre, first I spoke to a consultant, then was transferred to the Supervisor Thabiso Mahlangu in client servicing. This guy was as stupid as anything and quite rude... he said that I should just wait for next week Wednesday or later to receive the refund, when I followed all the cancellation procedures. They wont take any responsibility for their errors, and just carry on with business as usual, and they feel quite justified to just be rude and lay down the Discovery law. I then requested to speak to the Head of that area and Thabiso mentioned that he only knows that the Heads name is Lindo, but couldn't spell his surname, or provide me with any further contact details cause he didn't know them... Has Discovery also started to employ illiterate fools to cut their costs... is *****ing from clients not enough..... I don't know who else to escalate this issue to but Discovery's service is truly the most pathetic....and is down to the pits.