Pathetic service and support

Since December i am been having issues with WebAfrica overcharging me. when trying to phone in and explain this to the consultant, you get no assistance at all and they are of no help at all.

they have now cut my service because i refuse to pay the overcharge amount.

I would like to cancel with them because of their pathetic service, but they want me to give a one month notice although they overcharging me.