I'm ****ed off

My contract ended on the 25 of May and I went to the store on the 07 of April(Menlyn) and again on the 22(Woodlands) to fill the cancellation form on time as I am tired of their poor network but they didn't cancel it and I have been calling and calling and going in and out of telkom stores I'm sick and tired of them and now I can't have my number on prepaid or port it why the hell am I being forced and conered to continue with a contract although I have cancelled it in time