Disconnect number after contract expired

Cancelled my contract with Telkom following the expiry date and asked that my number be made prepaid, imagine my surprise this morning when I couldn't make or receive calls this morning. I called Telkom customer care line and spoke to a Thamsanqa who told me that my number has been cancelled and that there was no way of activating it or lodging a complaint seeing that someone from Telkom did not do their job properly. I am not willing to change my number, activate my number as prepaid as previously instructed!!!