Spend Limit unable to change

<p>My spend limit on a Telkom mobile contract has been permanently set to R500.</p> <p>I have been trying for over 4 months to have this changed.</p> <p>There is an option to permanently change and although I have done this every month since I got the contract It still does not.</p> <p>I have called the call center twice on this matter.</p> <p>I have emailed 3 times over and still no help.</p>