Billing issue

An amount of R449 was deducted from account by Telkom for their billing but they're denying that this billing was settled. I have sent my bank statement numerous times & spoke to a lot of people in their call centre who have made promises to have this settled but instead my line has been suspended. I escalated the matter to one of their Team Leader named Lebo & she also came back with the same script that I need to pay this R449 even though it was already deducted last month & I have sent the bank statement to her as well. I give up with Telkom & their incompetence.