Accounts and bad service from agent spoken to!

I called MTN to complain about the problem that I had, I bought data and airtime twice in one day within a period of 5 hours, data was depleted, airtime was exhausted, which has never happened before n when I called explaining to Lerato Pitso who was rude and kept screaming at me, that I can't have so much data depleted by just 2 applications(whatsap n Twitter) within 2 hours as that has never chowed that much data and airtime, I was so frustrated and she had no valued explanation and advised there's nothing she can do and that she would transfer me to their technical service, I told her I was not willing to hold only to get cut off n that I will stay on the line with her while she calls this department n that she must come back to me once she has someone for me on another line which she agreed to, few seconds later I got cut off, calling 808 is so much frustration as the call cuts numerous times before you can get thru to someone, I really am not please with MTN!! My number being a contract I want it terminated with emediate effect as I now want to port my number to vodacom, I've never had joy with MTN and seemingly I never will, I do not want anything to do with them anymore!