Supreme Call Rip-Off

Only recently notice that I have not been credited with my full credit and that Telkom just keeps this extra money for themselves. They don't pass the credit to your account. How is this possible. I have paid for the service and any excess money should be returned. Trying to get hold of Supreme call is impossible. Phone 10217 as per the website, then get shunted from pillar to post and still after numerous different wrong numbers being given still unable to get hold of them. I want to downgrade my account so that these bunch of ******* are left with less of my money for their unjustifiable salaries. Please give me a working contact number. And please don't apologize or feel sorry for me because you don't and do not care about your customers.