contract cancellation

I am very angry with MTN and their bad service. on Saturday i requested for my contract to be cancelled and for the number to be changed to prepaid and it was done the same day. Now my problem is my caller line identity is on private i cant change it. my network coverage is on GSM not EDGE, 3G OR 4G. i have tried to call the call centre more than ten times i could not get through untill my number got blocked to call the call centre. I tried using a different number then i spoke to tshepang whom decided to drop the phone on my ears because my number is on prepaid he even denied me to speak to a supervisor. i tried again to call in i spoke to Tshepo Mokoena. he told me to call the prepaid department. as ive explained more than ten times that i was told to call the contract department and i also could not get through to prepaid department. i spoke to a manager Proz Sayed who gave me his word that he will transfer me straight to a consultant for assistance. i was told my number is blocked and it means my problem will be resolved on the 1st. My network is not working at all. I am just asking for simple assistance with my network and caller line identity? is it too much too ask for???