Supersonic service is disgusting ,the level of unprofessionalism is very very bad

I'm really disappointed with level of unprofessionalism at supersonic, i escalated a billing query since September till date not one calls you don't even respond to your hello peter complain, when i call , I'm told there is no manager and nobody know why even up to date i have not received my refund, you really are a bad representation of MTN, your service is disgusting its very very very bad