Disappointed MTN user

I am very disappointed at MTN once again they have proven why I left them in the first place. I bought airtime last night and my airtime disappeared without me using it at all. Even the extra airtime I was given disappeared without me using it. I called and spoke to Amanda Ngoma, who dropped the line on me. I called again and spoke to someone else who also dropped the line as well. I called the third time and spoke to Mponeng who advised she would have a supervisor give me a call back as all of them were busy. I waited all night no call came. I called the following morning and again the agent I spoke to dropped the line on me as soon as he heard what my query was about. Mtn will take your airtime and tell you that you have subscribed to something. I have had this experience before and even left MTN once because of it. Now the phone I bought is MTN Locked so I had no choice but to use an MTN SIM card. Mtn is a ***** taking my money and talking about subscription I have no knowledge of. I have made it a point to always check on these so called subscriptions and I always remove them. And where did the free airtime go was it also taken by these subscriptions? No help whatsoever from your agents they are all useless, they don't even give the correct information. I am very disappointed