pathetic customer service from Nonny

Terrible customer service received from the call centre. It has been from 3pm to now pass 8pm and my problem has not been resolved. I called the call centre spoke to Mpho who assisted with some of my queries then the line was quiet. She did not have courtesy to call back to assist. I called back spoke to another agent told her my concerns and she was not knowledagble on couple thongs. When I requested to speak to team leader was told told no one is available. Then she did something on phone via smart tutor and she resetted settings without my permission. The phone switched off and she did not have courtesy to call me back as well. My phone I could not make or receive calls and font watsapp chat deleted and photos. I then phoned to have team leader to call me. Nonny is not a customer oriented person. She tried to call me, i.e when i phoned again that is when I realised my phone could not make calls or receive. Had to call about 20 times thereafter times leaving messages with different agents for her to call me. Even gave an alternate number but she never bother to return call. I regret purchasing samsung devices. Team leader that does not bother about customers. My phone they messed up. I spoke to Simon, Tidimalo, Tebatso, Vanessa and others. They put you on hold ad take long to come back or they cut call like Vanessa. Spent a lot of time and airtime today and my problem is not resolved and in a worst state as my phone is messed up. I lost valuable info.