Bad treatment received from a consultant at branch

My fone has been off since last week and on Monday i went to MTN in Knysna @ 12 pm and was helped by Christopher who told me that there was nothing wrong with my fone. the first thing he told me was that he is just new ans he will check...later on he checked and told me my fone is fine. i called 808 last nite and spoke to Lerato after holding 35 min she said all is well...still no access to anything and today i went MTN Knysna again and the minute i started telling Christopher about my problem, he said he knows nothing about customer lines he just works for MTN...i dont know why there is a walk in branch....when i told him that there is no way i can be out of credit on my account as i have an open line...he was rude with me and told me he wont help me anymore...he will help aother customers...all the clients were listening to him belittling me infront of them and Destumon the manager was laughing the whole time......i asked him if he could print me proof that i owe MTN and he said he has no access to printing and then told me he would like to help another customer ...i told him i will not leave before he sent me proof...i then offered to give my email address andhe sent it to me .