Bad service from rain

Good day I'm having a problem again with rain and I can't seem to get through to them via call centre as I called twice and they hang up,on the 3rd of this month I paid my subscription and today I recieved a message saying I should pay or my subscription is gonna be cut I'm not sure why? Last month you did the same thing and cut my subscription without explaining what the reason was before month end of which I'm still waiting for the explanation.... kindly tell me why is that you do that when I don't even owe ?????