cancelled my cell number without my consent

I had a contract with Telkom and has paid them in full on expiry of the contact. They cancelled my number from the network because I did not want to renew my contract with them. I have been using this cell number *** for the past 18 years and now I have lost all my contacts. I have called them more than 10 times and they keep on passing the buck. No one want to take responsibility. They promised to rei-nstate the line since October 2015 and up to now it has never been resolved. Please assist