*****ing my data and airtime

This has gone way to far. Ever since Friday, I can only send and receive whatsapp messages when it suits MTN, I mean like really this is my phone I pay y should I use it when it suits them. I was told that my window apps can't run on data less then I dnt even know how much, bt I use to run Facebook, whatsapp and instagram all at once with a 2mb. Since last night 7:11, I can't do nothing. Network is 3G bt no whatsapp no Facebook bt my data is just going and so is my airtime. I want this problem fixed. As I pay mtn to use my when not when it suits them. When I called on Friday after about 6pm on rude stupid agent that doesn't know his job. Dropped the call on me. If can't use my phone properly today. I'm taking this further. And its not my phone is the network. I want u to fix what ever u change since friday to the way it was. When I called and spoke to Mpho she was told me no manager is avaible until 7. I can't waitto change my number this will be before my contract ends.