network,service and many more

I have been a loyal customer to MTN for the past 10 years. I have never experienced any problems till recently. I buy 30-50 rands worth of airtime on a daily basis with this i convery half to data yet when I log onto the internet my airtime gets depleted instead of my data. I am constantly being told to sign into a network and to insert a sim card or data mobile will be blocked. Yet there is a sim card in my phone. Then i have suffiecient airtime and data on my phone and when i try n get on the net it says no funds MTN. Every single day I encounter these different issues and the worst part is everytime I contact the MTN center they transfer me to the technical department and I wait more than 20min to get help and guess what the agent cuts my call. To add to the list of problems there is never network. Wherever I go I am alwaaaaays having problems. In my flat is the worst. Geez this is so frustrating because if I land in an emergency situation what happens then???? MTN I am highly disappointed... changing my network real soon.