cancellation a Telkom contract is a night mare

On the 31 of January i took a contract for router and 20gb data at Brooklyn mall(10gb day and 10gb night). Instead of them loading them 20gb they only loaded 10gb (5gb day and 5gb night)

I then decided to cancel the contract since it was still under a cooling period,but the manager gave me a hard time refusing to cancel it.eventual I cancelled the contract and returned the device on the 02february.

Cancelation period is supposed to be 21 days ,but to this day my contract is still not cancelled.They keep on debiting my account . I have called call center couple of times but I'm being sent from pillar to post,I'm promised a call back by supervisors but no one has called me back.

We awaiting for the technician who I gave the device to to confirm that he received the device.he was sent countless emails but he is not responding and also the Brooklyn branch is under renovation so the store is closed.No one is able to assist me.

All I need is fort this case to be canceled and for Telkom to stop debiting my account.