Bad Customer service and attempts to frustrate process for terminating customer contract

Don't ever be tempted to take up a contract with Cell C, bad customer service with *********** staff. Back in February i gave them notice to terminate my contract and in the same mail expressing the frustration I endured while trying to terminate the contract telephonically with their Agents who seem to be trained in frustrating customers who want to terminate contracts by pushing them from pillar to post. they then tried to debit my account again with pro-rata subscription amount which i reversed at my bank, now they claim i owe them R179.00 and refuse to assist me, giving me excuses they are unable to assist me because their system cannot verify my security questions details. when they want to force you to take another contract there is no security clearance but when you want assistance from their customer services they cannot assist you. When you ask for supervisors they are in meetings and will call you back, but they never do.